He was first elected in the
2013 Montreal municipal election as a Projet Montréal candidate. In that election, he received 29% of the vote in a three-way race between himself, incumbent
Véronique Fournier of
Coalition Montréal, and Derek Robertson of
Équipe Denis Coderre pour Montréal. He was re-elected in
2017, receiving over 65% of the vote. Ahead of the
2021 Montreal municipal election, Sauvé left the Projet Montréal political party due to sexual assault allegations. He was re-elected with 52% of the vote. While in the opposition, Sauvé was Projet Montréal's transport critic, and as such has taken positions in favour of increased active transport infrastructure, increasing funding for the STM, and against the highway 19 extension. Sauvé has also taken a public stand against reversing the flow of petroleum pipeline 9b and opposed the P-6 bylaw. He currently is a special advisor to the executive committee as well as vice-chair of the board of directors of the
Société de transport de Montréal (STM). On March 28, 2024, Sauvé announced that he was standing for nomination for the
New Democratic Party's candidate in
LaSalle—Émard—Verdun at the
September 18, 2024 federal by-election. He received 26% of the vote and placed third, behind
Bloc Québécois candidate
Louis-Philippe Sauvé and
Liberal candidate Laura Palestini. He ran again in the same riding in the
2025 Canadian federal election and placed fourth, receiving 10.4% of the vote. On July 17, 2025, Sauvé joined
Transition Montréal and ran for
mayor under the party banner, placing fourth. Sauvé is also a
heavy metal musician. == Electoral record ==