Two months into his White House return, Trump has imposed tariffs on goods from neighboring Canada and Mexico as well as China, all steel and aluminum imports, and foreign cars and auto parts. He's threatened several other countries including traditional allies in the European Union with other steep tariffs ‒ even on European wine.

Canadian Prime Minister Mark Carney told President Donald Trump Wednesday that his nation will retaliate against the United States with tariffs of its own if Trump presses forward with his promised levies – potentially escalating what is already developing into an ugly and damaging trade war.