 He then became a leading proponent of Gaullism and one of the founders of the first Gaullist party, the Rassemblement du Peuple Français (Rally of the French People, or RPF) in 1947.In 1951 he was elected to the National Assembly as an RPF deputy for the Department of the Seine (Paris).From 1953 to 1955 he was vice-president of the National Assembly.