A Quebec court hears a challenge to the April 2025 federal election result, where a one-vote margin may be overturned due to a ballot counting error.

A court challenge has begun in Quebec’s Terrebonne riding over the April 28, 2025, federal election result, where Liberal candidate Tatiana Auguste won by a single vote over former Bloc Québécois MP Nathalie Sinclair-Desgagné. Sinclair-Desgagné’s lawyer, Stéphane Chatigny, argues a voter’s Charter rights were violated when her special ballot was not counted due to an address error on an envelope provided by Elections Canada. The lawyer claims the error may have affected 16 other special ballots and is seeking a new election. The three-day hearing started on October 20, 2025, in St-Jérôme, Que., with the outcome potentially overturning the narrow result.