Canada and the US worked together during Trump's first presidency when re-negotiating the North American Free Trade Agreement. Trump threatened to use tariffs then as well. His threat of tariffs on imports from Mexico led to an expansion of the Migrant Protection Protocols program across the US-Mexico border.

TORONTO (AP) — Canadian Prime Minister Justin Trudeau said Friday that if President-elect Donald Trump follows through on this threat to impose sweeping tariffs on Canadian products, he would be raising prices for Americans and hurting American business.

The president-elect said that he would impose the across-the-board tariffs on Day 1 and that they would stay in place until Canada, Mexico and China halted the flow of drugs and migrants.