Canadians on Monday started voting to choose a prime minister who will negotiate with President Trump over trade and security, and to navigate their economy through turbulence as businesses freeze spending and hiring.

The two leading candidates, Pierre Poilievre and Mark Carney, both plan to fight the U.S., its largest trading partner, over tariffs. But who would be more successful as relations grow icy?

In their backgrounds and political styles, Canadian election front-runners Mark Carney and Pierre Poilievre are a study in contrasts.