In 1819 he was elected to the Chamber of Deputies where he was leader of the liberal opposition until his death. Dirichlet was very well treated by General Foy, he was well paid yet treated like a member of the family.
Sa 1819 siya ay elected sa Chamber of Deputies na kung saan siya ay lider ng masaganang oposisyon hanggang sa kanyang kamatayan. Dirichlet ay tratuhin nang maayos sa pamamagitan ng Pangkalahatang Foy, siya ay mabuti bayad pa tratuhin tulad ng isang miyembro ng pamilya.