Trudeau faces leadership questions after byelection blow in Montreal Ottawa bureau chief Stuart Thomson talks to Quebec correspondent Antoine Trépanier about the humbling Liberal defeat in a Montreal byelection on Monday.

Canadian Prime Minister Trudeau faced the loss of his Liberal party at the ballot box on Monday, saying "there's more work to do" as his approval numbers continue to fall.

OTTAWA—Fresh off a stinging byelection loss in a longtime Liberal bastion in Montreal, the party’s veteran Quebec lieutenant is leaving to run for the party’s provincial leadership. The move by Transport Minister Pablo Rodriguez will leave a hole in Prime Minister Justin Trudeau’s cabinet — and likely lead to another cabinet shuffle just two months after another minister Seamus O’Regan left — and comes as the Liberal minority government enters a vulnerable stretch in which it will need the support of an opposition party to avoid triggering a federal election.