Originally posted by the Voice of America. Voice of America content is produced by the Voice of America, a United States federal government-sponsored entity, and is in the public domain. Ranking Chinese Leader Replaced Amid Reports of Probe by Associated Press BEIJING -- A Chinese politician considered a potential future leader has been replaced as head of the central mega-city of Chongqing amid reports he is facing a graft investigation. The move is a possible sign of a shakeup in roles ahead of a crucial Communist Party congress later this year. The South China Morning Post said Monday that Sun Zhengcai is being investigated by the ruling Communist Party's anti-graft arm. The Chongqing government said on its website Saturday that Sun Zhengcai was being replaced as head of the city's Communist Party committee by Chen Min-er. Both Sun and Chen sit on the party's 25-member Politburo and are considered candidates for promotion to the body's Standing Committee, the apex of political power in China. The Chongqing announcement gave no details on the move.