Chambrun trained as a lawyer and was appointed in 1892 to replace his brother as legal council at the French embassy in the
United States. He returned to France in 1897 and in 1898 was elected to the Chamber to represent Lozère, being reelected at each election until 1933 when he instead was elected to the senate. Chambrun was associated with various centre-right groupings, including the
Republican Federation,
Democratic Republican Alliance and the
Popular Democratic Party. Chambrun returned to the United States in 1917 as a member of
René Viviani's diplomatic mission and again in 1925 with
Joseph Caillaux to discuss French war debts. He served on many commissions in the Chamber and Senate. During the
Second World War, in June 1940, he was the only senator to vote against the abolition of the
French constitution and was one of the
eighty members of the French parliament who voted against the grant of special powers to
Philippe Pétain and the creation of the
Vichy régime. After the war he served in the
Provisional Consultative Assembly from 1944 to 1945. In 1947 he received the
Croix de guerre 1939-1945 for his work during the Second World War and was made a Chevalier of the
Légion d'honneur. ==Personal life and death==