Since 2019, Lebec has been part of the LREM parliamentary group's leadership around its chairman Gilles Le Gendre.Mathilde Siraud (14 January 2019), Le groupe LaREM à l'Assemblée muscle son équipe de porte-parole Le Figaro. In 2020, she assisted Le Gendre with coordinating the parliamentary group's support for the government's pension reform plans.Isabelle Ficek (16 January 2020), Retraites : les députés de la majorité qui vont porter le projet de loi à l'Assemblée Les Échos.
