[citation needed] In 1998, along with Guillaume Peltier, he founded the Youth Christian Action Association (AJAC), a movement which opposed the PACS and euthanasia.

[citation needed] It claimed around 250 members and was close to the National Republican Movement (MNR), led by Bruno Mégret.

[citation needed] Despite protests from within the party, he was selected to be National Front's candidate in Upper Normandy for the 2010 regional elections.

[5] On 15 February 2022, French media reported that Bay had been suspended from the National Rally due to his alleged support of Le Pen's challenger Éric Zemmour.

On 16 February 2022, he announced his support for candidate Éric Zemmour for the presidential election and join Reconquête where he was named Vice-President.