Peter Navarro, the President’s senior counselor for trade and manufacturing, was tackled by Sky’s US correspondent Mark Stone after Mr Trump on Wednesday announced a 25% tariff on steel and aluminum imports from the UK, a measure which took effect on March 12.

Trump and his aides have reportedly threatened to redraw the northern border, go after Canada’s minerals and water, and cancel NORAD.

It comes after the Canadian province of Ontario said it would suspend a 25% surcharge on US-bound electricity.

U.S. President Donald Trump has halted a plan to double tariffs on imports of Canadian steel and metal to 50%, just hours after announcing them.