Canada and the European Union quickly unveil retialatory levies against the U.S., hours after Trump's sweeping tariffs on steel and aluminum.

Trump’s 25% tariffs on steel and aluminum begin; Canada joins Europe with $20bn retaliation: Live updates - President’s action to protect American metals producers steps up campaign to reorder global

Mr. Trump said the decision came in response to Ontario's move to impose a 25% surcharge on electricity exports to the U.S. Mr. Trump has already imposed a 25% tariff on nearly all imports from Canada, and declared a 25% tariff rate on all steel and aluminum imports from any foreign country.