After nearly a decade in power, the Liberal Party seemed destined to be swept out on a wave of anti-incumbency sentiment. Then events took a surprising turn.

While millions of Canadians cast their ballots today, US President Donald Trump inserted himself into the mix with a jaw-dropping offer. He said Canada could have "zero tariffs" and "free access with no border" — if it would become "the beloved 51st state.

Canada is electing its next prime minister during a period of uncertainty over trade with the U.S. and President Trump's tariff threats. Conservative Pierre Poilievre is running against Prime Minister Mark Carney.