[1] A member of Renaissance (RE), he previously served in the National Assembly from 2022 to 2024, representing Paris's 14th constituency, which encompasses most of its 16th arrondissement.

[4][6] In 2019, he published his book Le paradis perdu : L'Amérique de Trump et la fin des illusions européennes.

Prior to being elected to the National Assembly, Haddad was an activist within the Union for a Popular Movement in the early 2010s.

In the 2022 legislative election, Haddad defeated Francis Szpiner of The Republicans in the 14th constituency of Paris with 53.2% of the second-round vote.

[2] In December 2023, Haddad co-authored a joint letter of more than a hundred senior European lawmakers to their counterparts in the United States, pleading for the United States Congress to unlock further military aid to Ukraine in response to the Russian invasion of the country.