The leader of the National Umma Party (NUP), Sadiq al-Mahdi has officially resigned from the chairmanship of the Nidaa Al-Sudan coalition, calling to review the bloc’s partnership with the other forces. Nidaa al-Sudan is an umbrella of political parties including the National Umma Party, the National Congress Party, the Sudan People's Liberation Movement and the Justice and Equality Movement. These are armed rebel movements that have been fighting the Khartoum-based ...