Supreme Court Nullifies Liberal MP’s Election Win By a Single Vote in Quebec Riding

Liberal MP Tatiana Auguste poses in her riding in Terrebonne, Que., on Dec. 20, 2025. The Canadian Press/Christinne Muschi

The Supreme Court of Canada has overturned the election outcome in the Montreal-area riding of Terrebonne where a Liberal MP secured victory by a single vote in April 2025.

A new byelection must now be held for the riding, which has historically been represented by the Bloc Québécois.