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.

The four candidates vying to become the next leader of Canada’s Liberal party have made the case during a debate why they are best suited to deal with U.S.

Liberal party members will select a successor to Trudeau, who earlier this year announced his resignation facing deep unpopularity, on March 9.