Members of the National Palace General Security Unit (USGPN) carry the coffin of Haiti's former President Rene Preval after his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) fix the Haiti National flag onto the coffin of Haiti's former President Rene Preval during his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haiti's President Jovenel Moise and First Lady Martine pass the coffin of Haiti's former President Rene Preval during his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval (C) waves to the attendants as she follows the members of the National Palace General Security Unit (USGPN) carrying the coffin of Haiti's former President Rene Preval after his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A priest who officiated the funeral of Haiti's former President Rene Preval embraces former First Lady Elisabeth D. Preval at the end of the religious ceremony in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval open her arms to embrace Haiti's President Jovenel Moise during the funeral of former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A woman shades herself from the sub with a book of religious songs for the funeral of Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval embraces Preval's daughter Patricia (L) during the funeral of Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haiti's President Jovenel Moise and First Lady Martine attend the funeral of former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Dominique (R) embraces her sister Patricia, daughters of Haiti's former President Rene Preval, during the funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A member of the orchestra rests during Haiti's former President Rene Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Scouts attend the funeral of Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) stand beside the coffin of Haiti's former President Rene Preval during his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) carry the coffin of Haiti's former President Rene Preval during the start of the acts for Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) stand beside the coffin of Haiti's former President Rene Preval during his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Auxiliary emeritus Bishop of the Archdiocese of Port-au-Prince Joseph Lafontant purifies with incense the coffin of Haiti's former President Rene Preval during Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haitians wear t-shirts with the picture of Haiti's former President Rene Preval as they attend his funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) wait for the start of the funeral for Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A man wearing a t-shirt with a picture of Haiti's former President Rene Preval attends Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. The t-shirt reads, "Thank you Little Rene". REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval (L) and Preval's daughters Dominique (2nd R) and Patricia attend the start of the acts for the funeral of Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Haitians chat as they wait for the start of the funeral for Haiti's former President Rene Preval in Port-au-Prince, Haiti, March 11, 2017. The poster reads in creole, "Thank you Little Rene. President Preval". REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) pull the coffin of Haiti's former President Rene Preval during the start of the acts for Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A woman conforts Haiti's former First Lady Elisabeth D. Preval (C) before the funeral for her husband, Haiti's former President Rene Preval, in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

Dominique (L) and Patricia, daughters of Haiti's former President Rene Preval, attend Preval's funeral in Port-au-Prince, Haiti, March 11, 2017. REUTERS/Andres Martinez Casares 

A mourner pays respect to former President Rene Preval at his vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

A mourner pays respect to former President Rene Preval at his vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval walks towards the coffin of her husband, Haiti's former President Rene Preval, before the vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

A member (C) of the National Palace General Security Unit (USGPN) relieves his colleague (L) at former President Rene Preval's vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

A man takes a picture of the coffin of former President Rene Preval during the vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) pay respect to former President Rene Preval at his vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haitians arrive to attend the vigil for former President Rene Preval in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval reacts as the coffin of her husband, Haiti's former President Rene Preval, arrives for a vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haitians wait to pay respect to former President Rene Preval during his vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

President Jovenel Moise and first lady Martine pass next to the coffin of former President Rene Preval at his vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

President Jovenel Moise and first lady Martine express their condolences to Elisabeth D. Preval (C) during the vigil for former President Rene Preval in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Members of the National Palace General Security Unit (USGPN) carry the coffin of former President Rene Preval at the vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

A member of the Legislative Palace Security Unit (USPL) carries a wreath during the vigil for former President Rene Preval in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval cries as the coffin of her husband, Haiti's former President Rene Preval, arrives for a vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares TPX IMAGES OF THE DAY 

Haiti's former First Lady Elisabeth D. Preval fixes the Haitian national flag on the coffin of her husband, Haiti's former President Rene Preval, during the vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Haiti's former First Lady Elisabeth D. Preval cries as the coffin of her husband, Haiti's former President Rene Preval, arrives for a vigil in Port-au-Prince, Haiti, March 10, 2017. REUTERS/Andres Martinez Casares 

Former Brazilian Presidents Dilma Rousseff and Luiz Inacio Lula da Silva chat with former Haitian Prime Minister Rene Preval before a tribute in honor of former Cuban leader Fidel Castro in Santiago de Cuba, Cuba, December 3, 2016. REUTERS/Carlos Barria 

Haitian President Michel Martelly (R) walks with former Haitian President Rene Preval towards an investors luncheon before the grand opening ceremony of the new Caracol Industrial Park in Caracol, Haiti, October 22, 2012. REUTERS/Larry Downing (HAITI - Tags: POLITICS) 

U.S. Secretary of State Hillary Clinton (L), Haiti's President Michel Martelly (C) and President of the Inter-American Development Bank Luis Alberto Moreno applaud Haiti's former President Rene Preval (not pictured) during the inauguration of the Caracol Industrial Park in Caracol October 22, 2012. Clinton presided over the opening of the $300 million industrial park in Haiti on Monday, a venture led by a South Korea textile company that could bring thousands of jobs to the poorest country in the Americas. REUTERS/Swoan Parker (HAITI - Tags: POLITICS BUSINESS INDUSTRIAL TEXTILE) 

President-elect Michel Joseph Martelly (C), sitting next to current President Rene Preval (centre L), shares a laugh with wife Sophia just before being sworn in as Haiti's new president Port-au-Prince May 14, 2011. Haiti's pop star-turned-president Martelly asked his people on Saturday to join him in rebuilding their poor, earthquake-ravaged nation and said he would work to provide jobs, health and education. REUTERS/Swoan Parker (HAITI - - Tags: POLITICS ELECTIONS) 

Haiti's former president Rene Preval (C) gives First Lady Sophia Martelly a kiss, as husband, newly sworn-in President Michel Martelly watches, during Martelly's
inauguration ceremony in Port-au-Prince May 14, 2011. REUTERS/Swoan Parker (HAITI - Tags: POLITICS) 

Haitian President Rene Preval speaks during a Security Council meeting on Haiti at the U.N. headquarters at the U.N. headquarters in New York, April 6, 2011. REUTERS/Shannon Stapleton (UNITED STATES - Tags: POLITICS) 

Haitian President Rene Preval shakes hands with United Nations Secretary-General Ban Ki-moon at the U.N. headquarters in New York, April 6, 2011. REUTERS/Shannon Stapleton (UNITED STATES - Tags: POLITICS) 

Haitian President Rene Preval shakes hands with United Nations Secretary-General Ban Ki-moon at the U.N. headquarters in New York, April 6, 2011. REUTERS/Shannon Stapleton (UNITED STATES - Tags: POLITICS) 

Haiti's outgoing president Rene Preval casts his ballot during presidential elections in Port-au-Prince March 20, 2011. Delays and missing materials dogged early voting on Sunday in Haiti's presidential run-off, which international donors hope can produce a stable leadership to guide recovery after last year's earthquake. The election presented Haiti's 4.7 million voters with a choice between a political newcomer, energetic entertainer and singer Michel Martelly, 50, and former first lady Mirlande Manigat, 70, a law professor and opposition matriarch. REUTERS/Eduardo Munoz (HAITI Tags: - Tags: POLITICS ELECTIONS) 

Residents apply lemon to the face of a boy who breathed in tear gas thrown by national policemen in a provisional camp for earthquake victims during clashes in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITl - Tags: POLITICS CIVIL UNREST) 

Demonstrators shout slogans calling for Haitian President Rene Preval to step down in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/Swoan Parker (HAITI - Tags : POLITICS CIVIL UNREST) 

Residents run away from tear gas thrown by national policemen in a provisional camp for earthquake victims during clashes with demonstrators in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITI - Tags: POLITICS CIVIL UNREST) 

Demonstrators run away from tear gas thrown by national policemen during clashes in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/Swoan Parker (HAITI - Tags: POLITICS CIVIL UNREST) 

A national policeman takes a position during clashes with demonstrators in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/Swoan Parker (HAITI - Tags: POLITICS CIVIL UNREST) 

A boy cries after breathing in tear gas thrown by national policemen in a provisional camp for earthquake victims during clashes with demonstrators in downtown Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITI - Tags: POLITICS CIVIL UNREST) 

Haitians take a part in a protest against the government in Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITI - Tags: POLITICS CIVIL UNREST) 

A policeman argues with protestors during a march protesting against the government in Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITI - Tags: POLITICS CIVIL UNREST) 

Haitians march in the streets protesting against the government in Port-au-Prince February 7, 2011. Around 200 protesters demanding that Haiti's outgoing President Rene Preval leave office immediately set up burning barricades on Monday and threw stones at police and U.N. peacekeepers in the capital Port-au-Prince, witnesses said. REUTERS/St-Felix Evens (HAITI - Tags: POLITICS CIVIL UNREST) 

A protester spray paints graffiti on a U.N police car during a demonstration against the presidential elections in Port-au-Prince January 23, 2011. The United Nations and Western powers urged Haiti's authorities on Thursday to amend the preliminary results of flawed November elections, warning that failure to do so could lead to more political turmoil. President Rene Preval's government and Haiti's electoral authorities are under intense pressure to accept a report by Organization of American States experts that recommends dropping a government-backed presidential candidate from a second-round runoff vote, in favor of another candidate. REUTERS/St-Felix Even (HAITI - Tags: CIVIL UNREST POLITICS) 

A protester spray paints a message that reads "down with MINUSTAH (the name of the U.N. mission in Haiti)" on a bus during a demonstration against the presidential elections in Port-au-Prince January 23, 2011. The United Nations and Western powers urged Haiti's authorities on Thursday to amend the preliminary results of flawed November elections, warning that failure to do so could lead to more political turmoil. President Rene Preval's government and Haiti's electoral authorities are under intense pressure to accept a report by Organization of American States experts that recommends dropping a government-backed presidential candidate from a second-round runoff vote, in favor of another candidate. REUTERS/St-Felix Even (HAITI - Tags: CIVIL UNREST POLITICS)