President Donald Trump escalated his trade war Tuesday, announcing on Truth Social that he will double the tariffs on steel and aluminum coming from Canada from 25% to 50% in retaliation for new trade restrictions put in place by the province of Ontario this week.

Trump said he would increase from 25% to 50% tariffs taking effect Wednesday for Canada after Ontario said it would hike electricity prices in the U.S.

At CERAWeek by S&P Global, regional energy ministers from across Canada expressed frustration with President Donald Trump’s morning announcement that he would increase tariffs on Canadian steel and aluminum to 50 percent. Trump had already placed a 25 percent tariff on Canadian goods, except for a lower 10 percent tariff on energy resources.