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.

President Donald Trump’s threat to double his planned tariffs on steel and aluminum from 25% to 50% for Canada has led the provincial government of Ontario to suspend its planned surcharges on electricity sold to the United States.