In parliament, Weingarten serves on the Defense Committee as well as on the Subcommittee on Disarmament, Arms Control and Non-Proliferation.[4]
In addition to his committee assignments, Weingarten has been serving as deputy chair of the German Parliamentary Friendship Group for Relations with Arabic-Speaking States in the Middle East since 2022.[5] In 2023, he joined a cross-party working group on dogs.[6]