OTTAWA — Prime Minister Mark Carney has announced three byelection for ridings in Ontario and Quebec which could result in the governing Liberals securing a razor-thin majority in the House of Commons.

A statement posted on the prime minister’s website says the votes will be cast on April 13 in the Toronto-area ridings of Scarborough Southwest and University-Rosedale and in the Montreal-area riding of Terrebonne.

The Supreme Court nullified the Liberal’s one-vote federal election win in Terrebonne after the Bloc Québécois candidate challenged the results when a supporter complained she tried to vote by mail using a special ballot that wasn’t counted.

Liberal Tatiana Auguste has been the member of Parliament since being declared the winner over Nathalie Sinclair-Desgagné, the Bloc Québécois candidate, until the Supreme Court invalidated the election last month.

“The Supreme Court decided today that every vote counts and that the vote of one person isn’t worth more than the vote of another, and that, when there is a tie, there should be a new election,” said Sinclair-Desgagné, reacting to the decision at the time.

“Up until today, someone was representing the riding who, however, did not have the legitimacy to do so. Fortunately, this was corrected today.”

Former Liberal MP Chrystia Freeland’s departure to become the adviser to Ukrainian President Volodymyr Zelenskyy left the riding of University—Rosedale vacant.

Bill Blair, also a former Liberal MP, left the riding of Scarborough Southwest vacant after he was appointed Canada’s high commissioner to the United Kingdom. Former provincial NDP deputy leader Doly Begum is running for the Liberals in the riding.

The Toronto ridings are considered to be safe seats for the Liberals, while Terrebonne was held by a Bloc Québécois MP before the last federal election.

The byelections will come two weeks after the federal NDP will select a new leader during their national convention in Winnipeg in late March.

This report by The Canadian Press was first published March 8, 2026

— With files from Michel Saba

Alessia Passafiume, The Canadian Press