In a significant political setback, Prime Minister Justin Trudeau's Liberal Party lost the LaSalle-Emard-Verdun by-election to the Bloc Quebecois, marking their second defeat in three months. The Bloc's Louis-Philippe Sauve secured 28% of the vote, narrowly defeating Liberal candidate Laura Palestini, who garnered 27.2%. This loss raises questions about Trudeau's leadership ahead of the next federal election.