Front-runner Mark Carney and underdog Chrystia Freeland, both established, centrist policymakers, are vying to succeed Justin Trudeau amid grave threats to Canada from the United States.

Frontrunners include Chrystia Freeland and Mark Carney, who are making the case they can guide Canada through domestic and international issues. At the top of the list: mounting trade tensions with the United States.

Mr Trudeau’s Liberal Party suddenly finds itself atop some opinion polls for the first time in almost two years, having scraped historic lows just two months ago. Mr Trump’s unsettling and relentless insistence that Canada join the United States as its 51st state or face staggering tariffs has cracked the basis on which Canada’s Conservatives and their leader,