TERREBONNE — Tatiana Auguste is returning to the House of Commons after winning a hotly contested byelection for the Liberals in the Quebec riding of Terrebonne.

The suburban riding near Montreal saw a rematch between Auguste and Bloc Québécois candidate Nathalie Sinclair-Desgagné a year after it produced the closest result in the country in the last federal election.

After a judicial recount of the results from last April, Auguste won by a single vote. Sinclair-Desgagné challenged the results all the way to the Supreme Court of Canada, which invalidated the results because of a clerical error on the return address for some mail-in ballots.

Early results suggested another tight race, with the lead flipping back and forth between the two candidates. A cheer went up at the Liberal gathering as TV screens showed Auguste leading by one vote. The lead was short-lived, however, since the next update showed the Bloc candidate back in the lead.

Later in the evening, the crowd got increasingly more raucous as results appeared to show Auguste’s lead growing.

Auguste was one of four MPs born in the 2000s who took a seat in the House of Commons in the federal election.

She told The Canadian Press late last year that she first got involved in a youth caucus with her local municipality and later worked for MP Emmanuel Dubourg, who represented a Montreal-area riding. She said those experiences encouraged her to “be part of the change” she wants to see.

As a member of Parliament, Auguste introduced a private member’s bill to establish a national strategy on flood and drought forecasting. She also worked to protect and promote the French language as vice-chair of the Canadian Branch of the Assemblée parlementaire de la Francophonie.

Speaking to reporters late Monday, Auguste said it had been a long year and that she was proud of her team.

Standing alongside cabinet ministers Marjorie Michel and Joël Lightbound, Auguste said in her victory speech that she was ready to work for all of her constituents.

Earlier Monday, Industry Minister Mélanie Joly told reporters at a Liberal gathering in Terrebonne that those watching the results in the riding likely would be in for a long night.

She said the ballot box question was about “who can offer stability in an unstable world, with a U.S. president who is very unpredictable.” She said the Liberals weren’t taking the riding for granted, even if the party was already on its way to securing a majority without it.

“Every single vote counts and every single riding counts,” she said.

Prime Minister Mark Carney said on social media that Auguste has worked “relentlessly” to build a better future for the people of Terrebonne.

“As a community builder and champion of the French language and culture, I’m pleased that Tatiana will keep working with our new government to build Québec strong and build Canada strong for all,” he said.

This report by The Canadian Press was first published April 14, 2026.

— By Catherine Morrison in Ottawa and Morgan Lowrie in Terrebonne, Que.

The Canadian Press staff