The increase in U.S. metals tariffs applies to all trading partners except Britain, the only country so far to strike a preliminary trade agreement with America during a 90-day pause on a wider array of Trump tariffs.

Prime Minister Mark Carney says his government is readying further retaliation measures if negotiations with the United States to end the recently doubled tariffs on steel and aluminum fail."We are in intensive negotiations with the Americans and in parallel preparing reprisals if those negotiations do not succeed,

Canadian Prime Minister Mark Carney on Wednesday denounced US President Donald Trump's doubling of tariffs on steel and aluminum to 50%.