In parliament, Warsmann has been serving on the Committee on Legal Affairs since 1995. From 2005 until 2007, Warsmann served as vice-president of the National Assembly, under the leadership of president
Jean-Louis Debré. Following the
2007 French legislative election, Warsmann succeeded
Philippe Houillon as chairman of the Committee on Legal Affairs. In this capacity, he was the parliament's
rapporteur on the
French constitutional law of 23 July 2008. In 2009, Warsmann introduced a bill according to which the
Church of Scientology cannot be dissolved in France even if it is convicted of fraud; the change in the relevant law made the maximum penalty for fraud committed by an organisation a ban on its activities in France. Also in 2009, the committee adopted a proposal made by Warsmann which provides for financial sanctions against any deputy who is absent from committee sessions more than once a month without justification. By 2012, Warsmann was replaced by
Jean-Jacques Urvoas. From 2007 until 2017, Warsmann was as one of twelve parliamentarians who served as judge on the
Cour de Justice de la République. In addition to his committee assignments, Warsmann is part of the French-German Parliamentary Friendship Group and the French-Luxembourg Parliamentary Friendship Group. Since 2020, Warsmann has been part of the
UDI and Independents group. ==References==