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KHARTUM, SUDAN - JANUARY 26: Head of National Umma Party and former Prime Minister Sadiq al-Mahdi (R) is welcomed by his supporters upon his return from Cairo after 30 months at Omdurman town of Khartoum, Sudan on January 26, 2017. (Photo by Ebrahim Hamid/Anadolu Agency/Getty Images)

KHARTUM, SUDAN - JANUARY 26:  Head of National Umma Party and former Prime Minister Sadiq al-Mahdi (R) is welcomed by his supporters upon his return from Cairo after 30 months at Omdurman town of Khartoum, Sudan on January 26, 2017.


 (Photo by Ebrahim Hamid/Anadolu Agency/Getty Images)