Career in national politics In addition to her work in local politics, Keller served on the
Senate from 2005 until 2019. In this capacity, she made headlines when she voted against her party's line and supported 2013 legislation introducing
same-sex marriage in France. She also wrote a 2018 report about
congestion pricing in
London and
Stockholm, which formed the basis for legislation making it easier for cities to introduce congestion pricing in a bid to reduce traffic jams and air pollution. In the Republicans'
2016 presidential primaries, Keller endorsed
Alain Juppé as the party's candidate for the office of
President of France. In November 2017, she co-founded
Agir. Under the leadership of party chairman
Franck Riester, she has since been serving as deputy chair alongside
Frédéric Lefebvre,
Laure de La Raudière and
Claude Malhuret. She eventually left
The Republicans in early 2018.
Member of the European Parliament, 2019–present Since becoming a
Member of the European Parliament, Keller has been serving on the
Committee on Civil Liberties, Justice and Home Affairs. In addition to her committee assignments, she is part of the Parliament's delegations for relations with the
Mashreq countries and to the Parliamentary Assembly of the
Union for the Mediterranean. She is also a member of the European Parliament Intergroup on Children's Rights, the URBAN Intergroup and the
MEPs Against Cancer group. In 2022, Keller became a
quaestor of the European Parliament, making her part of the Parliament's leadership under President
Roberta Metsola. On 17 September, Agir merged into La Republique en Marche as it reformed and rebranded under the name
Renaissance, which she joined. Following the
2024 European Parliament election in France, she retained her seat. ==Other activities==