New S.Sudan VP says Machar's time has passed South Sudan's new vice president warns that his predecessor and former friend Riek Machar should stay out of politics to allow peace. Taban Deng Gai, a powerful politician and fellow member of the Nuer tribe, was a loyal ally and friend of Machar before seizing the opportunity to replace him as First Vice President after clashes in the capital Juba last month. IMAGES AND SOUNDBITES. REFILING TO CORRECT SOUNDBITE 1.