WASHINGTON — United States president-elect Donald Trump is doubling down on his plans to impose tariffs on Canada in his first news conference since the certification of his election win.

Trump says he will be putting substantial tariffs against Canada and Mexico when he returns to the White House in less than two weeks.

The president-elect has previously said he’ll put 25 per cent duties on America’s closest neighbours unless they can stop the flow of illegal drugs across the border.

In November, Prime Minister Justin Trudeau travelled to Trump’s Mar-a-Lago estate in Florida to try and tamp down Trump’s tariff threats.