Trump, who takes office on Jan. 20, said he would impose a 25% tariff on imports from Canada and Mexico until they clamped down on drugs, particularly fentanyl, and migrants crossing the border, in a move that would appear to violate a free-trade deal.

Canada was scrambling Tuesday to blunt the impact of US President-elect Donald Trump's threat to implement steep tariffs once he takes office, as experts warned of a potentially "catastrophic" hit to the Canadian economy.