Trump at first imposed 25% tariffs on Canadian and Mexican exports to the U.S., then exempted the duties on Mexican- and Canadian-made vehicles being transported into the U.S. and later by week’s end delayed the tariffs on almost all items for four weeks until April 2.

Canadian and Chinese officials say they were already helping reduce fentanyl smuggling. Prime Minister Justin Trudeau said fentanyl crossing the northern border is "near zero."