Europe Ecology – The Greens
Since 2007, he has represented the Loire-Atlantique department, with an interruption between 2018 and 2019, originally as a member of the Democratic and Republican Left group, which includes his former political party Europe Ecology – The Greens. In 2015, he joined the Ecologist Party and later the La République En Marche group in Parliament. In 2017, he defeated Jean-Charles Taugourdeau and Laure de la Raudière for the presidency of the National Assembly.