US tariffs on steel and aluminum doubled from 25% to 50%, a move cheered by the beleaguered American steel industry but worrisome to sectors that heavily use the metals, from car makers to can manufacturers.

President Donald Trump has signed an executive order doubling steel and aluminum tariffs to 50 per cent. Prime Minister Mark Carney calls the move "illegal." As Troy Charles reports, Trump says it's necessary to protect the future of the industry in the U.