 He was elected as a municipal councillor from the Fifth Arrondissement (Ouenzé) of Brazzaville in 1992, and soon afterward he was elected to the National Assembly in the 1992 parliamentary election as the UP candidate in the Ignié constituency of Pool Region.He also stood as the UP candidate in the August 1992 presidential election, placing 11th with 0.45% of the vote.After his departure from Milongo's transitional government, Mbemba again practiced as a lawyer from July 1992 to October 1997, in addition to his political activities.