President-elect Donald Trump intends to follow through on his plan to impose sweeping tariffs on America’s top trading partners — a move that could come at a high cost to U.S. consumers. On Monday, Trump promised a new tariff on all products entering the U.

Prime Minister Justin Trudeau said that if President-elect Donald Trump follows through on this threat to impose tariffs on Canadian products, he would be raising prices and hurting American businesses.

The president-elect’s opening salvo in trade and border talks with the United States’ neighbors is casting a harsh light on the North American alliance.