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,

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.