Liberal candidate Tatiana Auguste, right, speaks to supporters with from left to right Minister of Health Marjorie Michel and Government Transformation, Public Works and Procurement Minister Joel Lightbound at her party's federal byelection night gathering in Terrebonne, Que., on Tuesday, April 14, 2026. THE CANADIAN PRESS/Christinne Muschi
Supreme Court explains why it invalidated Terrebonne results in 2025 federal election
Sep 18, 2026 | 8:26 AM
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MONTREAL — The Supreme Court of Canada says it decided to invalidate a federal Liberal candidate’s one-vote victory in the 2025 federal election to ensure public trust in the electoral process.
The court says the choice to annul the election result ensures that a federal election is not decided by a known and correctable administrative error.
Liberal Tatiana Auguste was declared the winner in the Montreal-area riding of Terrebonne by one vote over Bloc Québécois candidate Nathalie Sinclair-Desgagné in April 2025.
The Bloc candidate challenged the election results and demanded a byelection after a Bloc Québécois supporter complained that she had tried to vote by mail using a special ballot that was never counted.
