Akinwumi Ayodeji Adesina, President of the African Development Bank Group, and Ellen Johnson Sirleaf former President of Liberia attend the meeting of the 2020 African Economic Outlook report in Abidjan, Ivory Coast January 30, 2020. REUTERS/Luc Gnago 

Former Liberian President Ellen Johnson Sirleaf attends a Reuters interview in Kigali, Rwanda April 28, 2018. REUTERS/Jean Bizimana 

Former Liberian President Ellen Johnson Sirleaf speaks during a Reuters interview in Kigali, Rwanda April 28, 2018. REUTERS/Jean Bizimana 

Former Liberian President Ellen Johnson Sirleaf speaks during a Reuters interview in Kigali, Rwanda April 28, 2018. REUTERS/Jean Bizimana 

Former Liberian President Ellen Johnson Sirleaf speaks during a Reuters interview in Kigali, Rwanda April 28, 2018. REUTERS/Jean Bizimana 

Liberia's former President Ellen Johnson Sirleaf arrives to attend new President George Weah's swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf stands with new President George Weah during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf, new President George Weah and his wife Clar are seen during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf congratulates new President-elect George Weah during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President-elect George Weah are seen during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President-elect George Weah are seen during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf attends new President elect George Weah's swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former Vive President Joseph Nyumah Boakai (L), former President Ellen Johnson Sirleaf (C) and new President elect George Weah (R) are seen during his swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf attends new President elect George Weah's swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf (R) and her Vice President Joseph Nyumah Boakai attend new President George Weah's swearing-in ceremony at Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President elect George Weah are seen during his swearing-in ceremony at the Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President elect George Weah are seen during his swearing-in ceremony at the Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President elect George Weah are seen during his swearing-in ceremony at the Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's former President Ellen Johnson Sirleaf and the new President elect George Weah speak during his swearing-in ceremony at the Samuel Kanyon Doe Sports Complex in Monrovia, Liberia, January 22, 2018. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf walks towards Togolese President Togolese President Faure Gnassingbe during the 52nd ECOWAS Summit in Abuja, Nigeria December 16, 2017. REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson Sirleaf arrives at the 52nd ECOWAS Summit in Abuja, Nigeria December 16, 2017. REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson Sirleaf speaks during a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf attends a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf speaks during a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf attends a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf speaks during a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf speaks during a news conference at the Presidential Palace in Monrovia, Liberia October 12, 2017. REUTERS/Thierry Gouegnon 

Sierra Leone President Ernest Koroma joined by Liberian President Ellen Johnson Sirleaf are seen on arrival for the burial of victims of the mudslide, at the Paloko cemetery, in Waterloo, Sierra Leone August 17, 2017. Picture taken August 17, 2017. REUTERS/Afolabi Sotunde 

Sierra Leone Preisent Ernest Koroma is joined by Liberia President Ellen Johnson Sirleaf during the burial of victims of the mudslide at the Paloko cemetery, in Waterloo, Sierra Leone August 17, 2017. REUTERS/Afolabi Sotunde 

Sierra Leone Preisenf Ernest Koroma joined by Liberian President Ellen Johnson Sirleaf during the burial of victims of the mudslide at the Paloko cemetery, in Waterloo, Sierra Leone August 17, 2017. REUTERS/Afolabi Sotunde 

Sierra Leone Preisenf Ernest Koroma joined by Liberian President Ellen Johnson Sirleaf during the burial of victims of the mudslide at the Paloko cemetery, in Waterloo, Sierra Leone August 17, 2017. REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson-Sirleaf (L) and Ethiopia's Prime Minister Hailemariam Desalegn address a news conference at the National Palace during her official visit to Ethiopia's capital Addis Ababa, February 28, 2017. REUTERS/Tiksa Negeri 

Liberia's President Ellen Johnson-Sirleaf addresses a news conference at the National Palace during her official visit to Ethiopia's capital Addis Ababa, February 28, 2017. REUTERS/Tiksa Negeri 

Liberia's President Ellen Johnson-Sirleaf reviews a guard of honor at the National Palace during her official visit to Ethiopia's capital Addis Ababa, February 28, 2017. REUTERS/Tiksa Negeri 

Liberian president Ellen Johnson Sirleaf waves as she arrives for President Adama Barrow swearing-in ceremony and the Gambia's Independence day ceremony at Independence Stadium, in Bakau, Gambia February 18, 2017. REUTERS/Thierry Gouegnon 

Liberian President Ellen Johnson Sirleaf, Senegalese President Macky Sall, and Gambian President Adama Barrow (L-R) are seen during Barrow's swearing-in ceremony at the Independence Stadium, in Bakau, Gambia February 18, 2017. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf (R) arrives for the 28th Ordinary Session of the Assembly of the Heads of State and the Government of the African Union in Ethiopia's capital Addis Ababa, January 31, 2017. REUTERS/Tiksa Negeri 

Liberia's President Ellen Johnson Sirleaf attends the 28th Ordinary Session of the Assembly of the Heads of State and the Government of the African Union in Ethiopia's capital Addis Ababa, January 30, 2017. Picture taken January 30, 3017. REUTERS/Tiksa Negeri 

(L-R) Liberia's President Ellen Johnson-Sirleaf, Nigeria's President Muhammadu Buhari, Senegal's President Macky Sall and former Ghanian President John Mahama pose for pictures during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Nigerian President Muhammadu Buhari receives Liberia's President Ellen Johnson-Sirleaf during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Nigeria's President Muhammadu Buhari receives Liberia's President Ellen Johnson-Sirleaf during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Nigeria's President Muhammadu Buhari receives Liberia's President Ellen Johnson-Sirleaf during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Nigeria's President Muhammadu Buhari receives Liberia's President Ellen Johnson-Sirleaf during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Nigeria's President Muhammadu Buhari receives Liberia's President Ellen Johnson-Sirleaf during the special meeting of Ecowas delegations on Gambia election crisis in Abuja, Nigeria January 9, 2017. REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson Sirleaf is pictured during the swearing-in of Ghana's new President Nana Akufo-Addo in Accra, Ghana January 7, 2017. REUTERS/Luc Gnago 

Liberia's President Ellen Johnson Sirleaf arrives for the international mediation on Gambia election conflict in Banjul, Gambia December 13, 2016 REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson Sirleaf arrives for the international mediation on Gambia election conflict in Banjul, Gambia December 13, 2016 REUTERS/Afolabi Sotunde 

Liberia's President Ellen Johnson Sirleaf is seen on arrival for the international mediation on Gambia election conflict in Banjul, Gambia December 13, 2016 REUTERS/Afolabi Sotunde 

Canada's Prime Minister Justin Trudeau greets Liberian President Ellen Johnson Sirleaf at the airport outside Monrovia, Liberia, November 24, 2016. REUTERS/James Giahyue 

Liberia's President Ellen Johnson-Sirleaf waits to address the 71st United Nations General Assembly in Manhattan, New York, U.S. September 22, 2016 REUTERS/Eduardo Munoz 

Liberia's President Ellen Johnson-Sirleaf addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 22, 2016. REUTERS/Eduardo Munoz 

Liberia's President Ellen Johnson-Sirleaf addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 22, 2016. REUTERS/Eduardo Munoz 

Liberia's President Ellen Johnson-Sirleaf addresses the United Nations General Assembly in the Manhattan borough of New York, U.S., September 22, 2016. REUTERS/Eduardo Munoz 

(L-R) Japan International Cooperation Agency (JICA) Shinichi Kitaoka, Nigeria's former President Olusegun Obasanjo, Rwanda's President Paul Kagame, Liberia's President Ellen Johnson-Sirleaf, African Development Bank President Akinwumi Adesina and economist Joseph Eugene Stiglitz at Colombia University attend the Japan International Cooperation Agency (JICA) High Level Panel as part of the Sixth Tokyo International Conference on African Development (TICAD VI) in Kenya's capital Nairobi, August 28, 2016. REUTERS/Thomas Mukoya 

Rwanda's President Paul Kagame (L), flanked by Liberia's President Ellen Johnson-Sirleaf, addresses the Japan International Cooperation Agency (JICA) High Level Panel as part of the Sixth Tokyo International Conference on African Development (TICAD VI) in Kenya's capital Nairobi, August 28, 2016. REUTERS/Thomas Mukoya 

Rwanda's President Paul Kagame, flanked by Liberia's President Ellen Johnson-Sirleaf (R) and Nigeria's former President Olusegun Obasanjo (L), attends the Japan International Cooperation Agency (JICA) High Level Panel as part of the Sixth Tokyo International Conference on African Development (TICAD VI) in Kenya's capital Nairobi, August 28, 2016. REUTERS/Thomas Mukoya 

Liberia's President Ellen Johnson-Sirleaf addresses the Japan International Cooperation Agency (JICA) High Level Panel as part of the Sixth Tokyo International Conference on African Development (TICAD VI) in Kenya's capital Nairobi, August 28, 2016. REUTERS/Thomas Mukoya 

Liberia's President Ellen Johnson-Sirleaf attends the Sixth Tokyo International Conference on African Development (TICAD VI) in Kenya's capital Nairobi, August 27, 2016. REUTERS/Thomas Mukoya 

U.S. first lady Michelle Obama (L) sits with Liberian President Ellen Johnson Sirleaf as she talks with students at the R. S. Caulfield School girls center in Margibi County, Liberia, June 27, 2016. REUTERS/Thierry Gouegnon 

Liberia's President Ellen Johnson Sirleaf talks to delegates during the 26th Ordinary Session of the Assembly of the African Union (AU) at the AU headquarters in Ethiopia's capital Addis Ababa, January 31, 2016. REUTERS/Tiksa Negeri