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.

Carney, 59, will succeed Justin Trudeau, who announced in January that he would step down amid low approval ratings following a decade in office.

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.