Bongo held the post of High Personal Representative of the President of the Republic from 1987 to 1989. In 1989, his father appointed him to the government as Minister of Foreign Affairs and Cooperation, replacing Martin Bongo. He was considered a reformist within the ruling PDG in the early 1990s. In the 1990 parliamentary election (the first election after the introduction of multiparty politics), he was elected to the National Assembly as a PDG candidate in Haut-Ogooué Province. After two years as Foreign Minister, a 1991 constitutional amendment setting a minimum age of 35 for ministers resulted in his departure from the government.