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JOHANNESBURG, SOUTH AFRICA - DECEMBER 02: President of Sierra Leone Julius Maada Bio attends the Global Citizen Festival: Mandela 100 at FNB Stadium on December 2, 2018 in Johannesburg, South Africa. (Photo by Noam Galai/Getty Images for Global Citizen Festival: Mandela 100)

JOHANNESBURG, SOUTH AFRICA - DECEMBER 02: President of Sierra Leone
Julius Maada Bio speaks on stage during the Global Citizen Festival: Mandela 100 at FNB Stadium on December 2, 2018 in Johannesburg, South Africa. (Photo by Jemal Countess/Getty Images for Global Citizen Festival: Mandela 100)

JOHANNESBURG, SOUTH AFRICA - DECEMBER 02: President of Sierra Leone
Julius Maada Bio speaks on stage during the Global Citizen Festival: Mandela 100 at FNB Stadium on December 2, 2018 in Johannesburg, South Africa. (Photo by Jemal Countess/Getty Images for Global Citizen Festival: Mandela 100)

CHANGSHA, CHINA - SEPTEMBER 06: Sierra Leonean President Julius Maada Bio speaks during the opening ceremony of the 4th Investing in Africa Forum at Meixi Lake Hotel on September 6, 2018 in Changsha, Hunan Province of China. (Photo by Visual China Group via Getty Images via Getty Images)

Ivorian President Alassane Ouattara (R) and Sierra Leone president Julius Maada Bio (L) hold a meeting on May 4, 2018 at the presidentaial palace in Abidjan. (Photo by SIA KAMBOU / AFP) (Photo credit should read SIA KAMBOU/AFP via Getty Images)

Ivorian President Alassane Ouattara (R) welcomes Sierra Leone president Julius Maada Bio (L) prior to a meeting on May 4, 2018 at the presidentaial palace in Abidjan. (Photo by SIA KAMBOU / AFP) (Photo credit should read SIA KAMBOU/AFP via Getty Images)

Opposition challenger Julius Maada Bio of the Sierra Leone People's Party (SLPP), enters a car as he leaves after casting his vote on March 31, 2018 in Freetown, during the second round of Sierra Leone's presidential election.
Voting began on March 31 in Sierra Leone in the final round of a delayed run-off presidential election after a campaign marked by verbal sparring, sporadic violence and a last-minute legal battle. / AFP PHOTO / ISSOUF SANOGO (Photo credit should read ISSOUF SANOGO/AFP via Getty Images)

Opposition challenger Julius Maada Bio (C) of the Sierra Leone People's Party (SLPP), leaves after casting his vote on March 31, 2018 in Freetown, during the second round of Sierra Leone's presidential election.
Voting began on March 31 in Sierra Leone in the final round of a delayed run-off presidential election after a campaign marked by verbal sparring, sporadic violence and a last-minute legal battle. / AFP PHOTO / ISSOUF SANOGO (Photo credit should read ISSOUF SANOGO/AFP via Getty Images)