Former Portuguese Prime Minister Jose Socrates (R) enters a car after visiting former President Mario Soares (not pictured) in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates (R) is congratulated by people after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates enters a car after visiting former President Mario Soares (not pictured) in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates leaves his house after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, enters a car after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, looks at his mobile phone after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, talks to journalists after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, talks to journalists after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, talks to journalists after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, kisses people after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates, talks to journalists after being released from house arrest in Lisbon, Portugal, October 17, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Media crew speak in front of the house of former Portuguese Prime Minister Jose Socrates after his release from house arrest in Lisbon, Portugal, October 16, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Joao Araujo (R), the lawyer of former Portuguese Prime Minister Jose Socrates, is congratulated by people after talking to journalists following the release of his client from house arrest in Lisbon, Portugal, October 16, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Joao Araujo, the lawyer of former Portuguese Prime Minister Jose Socrates, talks to journalists after his client was released from house arrest in Lisbon, Portugal, October 16, 2015. Socrates, who was jailed in November last year on suspicion of corruption before being placed under house arrest, was freed on Friday as an investigation into alleged tax fraud and graft continues. He denies any wrongdoing and calls the case against him an "enormous, cruel injustice." REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates prepares to vote in the Portuguese general election at a polling station in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates prepares to vote in the Portuguese general election at a polling station in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates prepares to vote in the Portuguese general election at a polling station in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates leaves a polling station after voting in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received a permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates leaves a polling station after voting in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates votes in the Portuguese general election at a polling station in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Former Portuguese Prime Minister Jose Socrates prepares to vote in the Portuguese general election at a polling station in Lisbon, Portugal, October 4, 2015. Socrates, who is under house arrest, received permission from the Portuguese authorities to vote. REUTERS/Juan Medina

Police forces are seen near the house where former Portuguese Prime Minister Jose Socrates is placed under house arrest in Lisbon, Portugal, September 4, 2015. REUTERS/Hugo Correia

Former Portuguese Prime Minister Jose Socrates (C) is placed under house arrest in Lisbon by police forces, Portugal, September 4, 2015. REUTERS/Hugo Correia

Media members stand near the house where former Portuguese Prime Minister Jose Socrates is placed under house arrest in Lisbon, Portugal, September 4, 2015. REUTERS/Hugo Correia

Media members stand near the house where former Portuguese Prime Minister Jose Socrates is placed under house arrest in Lisbon, Portugal, September 4, 2015. REUTERS/Hugo Correia

The car believed to be carrying Portugal's former prime minister, Jose Socrates (unseen), arrives in a convoy at Campus de Justica in Lisbon February 23, 2015. Socrates will testify in the Department of Investigation and Prosecution (DIAP) as part of an investigation on breaches of secrecy of justice in the case which he is accused. Socrates has been detained since last November in Evora prison for suspected tax fraud and corruption.
REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

The car believed to be carrying Portugal's former prime minister, Jose Socrates (unseen), arrives in a convoy at Campus de Justica in Lisbon February 23, 2015. Socrates will testify in the Department of Investigation and Prosecution (DIAP) as part of an investigation on breaches of secrecy of justice in the case which he is accused. Socrates has been detained since last November in Evora prison for suspected tax fraud and corruption.
REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Portugal's former Socialist prime minister Jose Socrates leaves the court in a convoy in Lisbon November 25, 2014. A Portuguese judge charged Socrates, whose arrest on Friday shocked the country and his Socialist party that hopes to win next year's election, with corruption and tax fraud and ordered that he remain in preventive custody. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS BUSINESS CRIME LAW)

Jose Araujo, lawyer of former Portuguese prime minister Jose Socrates leaves the Criminal Court in Lisbon November 24, 2014. A Portuguese judge charged former prime minister Jose Socrates, whose arrest on Friday shocked the country and his Socialist party that hopes to win next year's election, with corruption and tax fraud and ordered that he remain in preventive custody. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Judge Carlos Alexandre leaves the Criminal Court in Lisbon November 24, 2014. Alexandre on Monday charged former prime minister Jose Socrates, whose arrest on Friday shocked the country and his Socialist party that hopes to win next year's election, with corruption and tax fraud and ordered that he remain in preventive custody. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Police keep members of the media back as Portugal's former Socialist prime minister Jose Socrates leaves the court inside a car in Lisbon November 23, 2014. Police transferred Socrates back to his cell at a police station late on Sunday where he will spend a third night in a row after his shocking arrest and questioning in a corruption investigation. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS BUSINESS CRIME LAW MEDIA)

Portugal's former prime minister Jose Socrates arrives escorted by police at Lisbon Court for questioning, in Lisbon November 23, 2014. Portuguese police have arrested former Socialist prime minister Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW BUSINESS)

Portugal's former prime minister Jose Socrates (C) arrives escorted by police at Lisbon Court for questioning, in Lisbon November 23, 2014. Portuguese police have arrested former Socialist prime minister Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW BUSINESS)

Jose Araujo, lawyer of former Portuguese prime minister Jose Socrates, smokes outside the court in Lisbon November 22, 2014. Portuguese police have arrested Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS BUSINESS CRIME LAW)

Former Portuguese Socialist prime minister Jose Socrates (L) arrives a court before a criminal judge for questioning, in Lisbon November 22, 2014. Portuguese police have arrested Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS BUSINESS CRIME LAW)

Portugal's former prime minister Jose Socrates arrives at Lisbon Court escorted by police for questioning, in Lisbon November 22, 2014. Portuguese police have arrested former Socialist prime minister Jose Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Police officers stand guard at Lisbon Court in Lisbon November 22, 2014. Portuguese police have arrested former Socialist prime minister Jose Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Portugal's former prime minister Jose Socrates (L) arrives at Lisbon Court escorted by police for questioning, in Lisbon November 22, 2014. Portuguese police have arrested former Socialist prime minister Jose Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Portugal's former prime minister Jose Socrates arrives at Lisbon Court escorted by police for questioning, in Lisbon November 22, 2014. Portuguese police have arrested former Socialist prime minister Jose Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS CRIME LAW)

Members of the media take pictures of a police van outside a court where former Socialist Prime Minister Jose Socrates would be brought before a criminal judge for questioning, in Lisbon November 22, 2014. Portuguese police have arrested Socrates and three other people in an investigation of suspected tax fraud, corruption and money-laundering, the Prosecutor General's office said on Saturday. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS BUSINESS CRIME LAW)

The new secretary-general of Socialist Party Jose Seguro, waves at the end of a news conference at the party's headquarters in Lisbon July 23, 2011. Seguro has won the Socialist Party's internal elections to replace former Secretary-General and Prime Minister Jose Socrates. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS)

The new general secretary of Socialist Party Jose Seguro waves as he arrives to the headquarters of the Socialist Party in Lisbon July 23, 2011. Seguro has won the Socialist Party's internal elections to replace former Secretary General and Prime Minister Jose Socrates. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS)

Portugal's former Prime Minister Jose Socrates (C) listens to a speech by his successor Pedro Passos Coelho during the latter's swearing-in ceremony at Ajuda palace in Lisbon June 21, 2011. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates reacts during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS HEADSHOT)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates reacts during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates gestures during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates reacts during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates gestures during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates is seen during the general election in Lisbon June 5, 2011. Socrates resigned as head of the Socialist Party on Sunday after it lost a general election to the centre-right Social Democrats. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates arrives to vote in the Portuguese general elections at a polling station in Lisbon June 5, 2011. The Portuguese went to the polls on Sunday to elect a government which will lead the nation through a period of deep austerity and recession after it received a 78-billion-euro bailout from the European Union and IMF. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and caretaker Prime Minister Jose Socrates casts his vote during the general election in Lisbon June 5, 2011. The Portuguese went to the polls on Sunday to elect a government which will lead the nation through a period of deep austerity and recession after it received a 78-billion-euro bailout from the European Union and IMF. REUTERS/Rafael Marchante (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and Prime Minister caretaker Jose Socrates smiles after casting his vote during the general election in Lisbon June 5, 2011. The Portuguese went to the polls on Sunday to elect a new government which will lead the nation through a period of deep austerity and recession after it received a 78-billion-euro bailout from the European Union and IMF. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS HEADSHOT)

Portugal's Socialist Party candidate and Prime Minister caretaker Jose Socrates casts his vote during the general election in Lisbon June 5, 2011. The Portuguese went to the polls on Sunday to elect a new government which will lead the nation through a period of deep austerity and recession after it received a 78-billion-euro bailout from the European Union and IMF. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist Party candidate and Prime Minister caretaker Jose Socrates casts his vote during the general election in Lisbon June 5, 2011. The Portuguese went to the polls on Sunday to elect a new government which will lead the nation through a period of deep austerity and recession after it received a 78-billion-euro bailout from the European Union and IMF. REUTERS/Hugo Correia (PORTUGAL - Tags: POLITICS ELECTIONS)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates addresses supporters during his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government
with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout
agreed this month with the European Union and the IMF.
REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates salutes supporters at the end of his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout agreed this month with the European Union and the IMF. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS ELECTIONS BUSINESS)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates addresses supporters during his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout agreed this month with the European Union and the IMF. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS ELECTIONS BUSINESS)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates is welcomed by supporters during his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout agreed this month with the European Union and the IMF. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS ELECTIONS BUSINESS)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates gestures during his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout agreed this month with the European Union and the IMF. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS ELECTIONS BUSINESS HEADSHOT)

Portugal's Socialist candidate and caretaker Prime Minister Jose Socrates addresses supporters during his last electoral campaign rally in Lisbon June 3, 2011. Portugal's centre-right Social Democrats held their lead over ruling Socialists in a poll out on Friday, putting them on track to form a majority government with rightist CDS party just two days before Sunday's election. The next administration will have to enact tough austerity plans included in a 78 billion euro ($111.4 billion) bailout agreed this month with the European Union and the IMF. REUTERS/Jose Manuel Ribeiro (PORTUGAL - Tags: POLITICS ELECTIONS BUSINESS)