[1] He has served as president of Massif des Brasses since 2021,[2] and as a general delegate of the Union of the Right for the Republic since 2024.
[3] Valentin was formerly a member of Debout la France, and was elected departmental secretary of the party in Haute-Savoie in 2014.
[2] He endorsed the manifesto of Julien Aubert for the 2022 presidential election,[11] and sponsored the candidacy of Éric Zemmour.
[12] In the 2024 legislative election, he was the candidate of The Republicans for Haute-Savoie's 3rd constituency, with the endorsement of the National Rally and Reconquête.
[14] He joined Éric Ciotti's newly founded Union of the Right for the Republic in 2024 and was appointed general delegate for local collectivities.