Former Editor of the News of the World Andy Coulson arrives for the sentencing at the Old Bailey court house in London July 4, 2014. British Prime Minister David Cameron's former media chief Coulson was jailed for 18 months on Friday for being complicit in industrial scale phone-hacking by journalists at the Rupert Murdoch tabloid he edited. REUTERS/Neil Hall 

Former Editor of the News of the World Andy Coulson arrives for the sentencing at the Old Bailey court house in London July 4, 2014. British Prime Minister David Cameron's former media chief Coulson was jailed for 18 months on Friday for being complicit in industrial scale phone-hacking by journalists at the Rupert Murdoch tabloid he edited. REUTERS/Neil Hall 

Former News of the World reporter James Weatherup leaves after the sentencing at the Old Bailey court house in London July 4, 2014. British Prime Minister David Cameron's former media chief Andy Coulson was jailed for 18 months on Friday for being complicit in industrial scale phone-hacking by journalists at the Rupert Murdoch tabloid he edited. Three other senior journalists from News of the World newspaper Greg Miskiw, Neville Thurlbeck and Weatherup, were also sentenced on Friday. Miskiw and Thurlbeck were sentenced to six months in jail while Weatherup was given a 4 month suspended sentence. REUTERS/Neil Hall 

Private investigator Glenn Mulcaire leaves after the sentencing at the Old Bailey court house in London July 4, 2014. British Prime Minister David Cameron's former media chief Andy Coulson was jailed for 18 months on Friday for being complicit in industrial scale phone-hacking by journalists at the Rupert Murdoch tabloid he edited. Mulcaire, the former private investigator who conducted much of the hacking, was given a six month suspended sentence. REUTERS/Neil Hall 

Former editor of the News of the World Andy Coulson arrives at the Old Bailey courthouse in London June 30, 2014. British Prime Minister David Cameron's ex-media chief Coulson will face a re-trial over whether he sanctioned illegal payments to a public official while editing a Rupert Murdoch tabloid, prosecutors said on Monday. REUTERS/Neil Hall 

Former editor of the News of the World Andy Coulson travels in a taxi cab after leaving the Old Bailey courthouse in London June 25, 2014. The jury in Britain's phone-hacking trial was discharged on Wednesday after failing to reach agreement on whether Andy Coulson, the former media adviser to Prime Minister David Cameron, was guilty of authorising illegal payments. Coulson, who had edited Rupert Murdoch's now-defunct News of the World tabloid, was on Tuesday found guilty of conspiring to hack into phones. REUTERS/Neil Hall 

Former editor of the News of the World Andy Coulson leaves the Old Bailey courthouse in London June 25, 2014. The jury in Britain's phone-hacking trial was discharged on Wednesday after failing to reach agreement on whether Andy Coulson, the former media adviser to Prime Minister David Cameron, was guilty of authorising illegal payments. Coulson, who had edited Rupert Murdoch's now-defunct News of the World tabloid, was on Tuesday found guilty of conspiring to hack into phones. REUTERS/Neil Hall 

Andy Coulson, former editor of the News of the World and Former spokesman for Britian's Prime Minister David Cameron, leaves after giving evidence before the Leveson Inquiry into the ethics and practices of the media at the High Court in central London May 10, 2012. REUTERS/Andrew Winning 

Andy Coulson (R), the former spokesman for Britain's Prime Minister David Cameron makes a statement to the press outside his home in Dulwich, south east London July 24, 2012. Coulson and Rupert Murdoch's former UK newspaper boss, Rebekah Brooks, are to be charged with phone-hacking offences in the most significant development in a scandal that has rocked Britain's establishment. REUTERS/Paul Hackett 

Andy Coulson, former editor of the News of the World and Former spokesman for Britian's Prime Minister David Cameron, leaves after giving evidence before the Leveson Inquiry into the ethics and practices of the media at the High Court in central London May 10, 2012. REUTERS/Andrew Winning 

Britain's opposition Conservative Party's communications chief Andy Coulson leaves Portcullis House in London July 21, 2009. Coulson, the media adviser to the leader of Britain's opposition Conservatives said on Tuesday he believed a "rogue reporter" was to blame for phone hacking when he edited a Rupert Murdoch tabloid.
REUTERS/Stefan Wermuth 

Andy Coulson, former News of the World newspaper editor and Prime Minister David Cameron's director of communications, leaves the High Court in Glasgow, Scotland December 9, 2010. Coulson gave evidence in the trial involving former Scottish politician Tommy Sheridan and his wife Gail, both of whom deny committing perjury during a successful defamation action against the News of the World in 2006, local media reported. REUTERS/David Moir 

Police officers arrive at the home of Andy Coulson, the former communications director of Britain's Prime Minister David Cameron, in south London July 8, 2011. Police arrested Cameron's former spokesman on Friday over the scandal that has shut down Rupert Murdoch's News of the World, forcing the prime minister to defend his judgment while promising sweeping new rules for the British press. REUTERS/Paul Hackett 

Britain's Prime Minister David Cameron speaks during a news conference at number 10 Downing Street in London July 8, 2011. Cameron said on Friday he believed that his former communications chief Andy Coulson was being investigated over allegations of phone hacking during his time as editor of the News of the World. REUTERS/Peter Macdiarmid/pool 

Britain's opposition Conservative Party's communications chief Andy Coulson leaves Portcullis House in London July 21, 2009. Coulson, the media adviser to the leader of Britain's opposition Conservatives said on Tuesday he believed a "rogue reporter" was to blame for phone hacking when he edited a Rupert Murdoch tabloid.
REUTERS/Stefan Wermuth