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.

President Trump signed an order Tuesday doubling tariffs on steel and aluminum imports from 25% to 50% for al trading partners except the U.S. — drawing swift criticism from officials in neighboring Canada and Mexico.