Trump's promise to impose a 25% tariff on all imports from Canada and Mexico mimics his old strategy of using tariff threats as a negotiating tool.

The president-elect’s threat to hit Canada, Mexico and China with new tariffs is already rocking business and diplomatic relationships and could topple the trade pacts he signed in his first term.

Trump issued the tariff threat on Monday while criticizing a surge in illegal migration, despite data showing apprehensions at the southern U.S. border are near a four-year low. Apprehension figures at the Canadian border remain significantly lower by comparison.