OTTAWA — The race to replace Canadian Prime Minister Justin Trudeau is dominated by one name: Donald Trump. How to wrestle with the incoming president and his tariff threats has emerged as the defining question in the Liberal Party leadership contest.

Canada's ruling Liberal Party is looking for a new leader to replace Prime Minister Justin Trudeau, announced on Jan. 6 he intended to step down. The Liberal Party will pick a new chief on March 9. Karina Gould,

Chrystia Freeland, the former deputy prime minister, sought to distance herself from Mr. Trudeau in a public letter criticizing him for “costly political gimmicks.”