A former member of the Union for a Popular Movement (UMP), in 2017 he switched parties to sit under the leadership of Marine Le Pen.

[1] He served as vice-president of the French National Assembly from 2022 to 2024 Openly homosexual, Chenu founded GayLib, then the LGBT wing of the Union for a Popular Movement (UMP), today part of the Union of Democrats and Independents (UDI).

[3] Chenu was a vice president of the Communauté d'agglomération du Beauvaisis from 2001 to 2014, when he served as a deputy to Mayor Caroline Cayeux of Beauvais.

For the 2021 regional election, Chenu was chosen to lead the National Rally list in Hauts-de-France.

On 12 November 2023, he took part in the March for the Republic and Against Antisemitism in Paris in response to the rise of anti-Semitism in France since the start of the Israel–Hamas war.