Last Monday on the website Truth Social, President-elect Donald Trump made clear his intention to impose a substantial tariff on products imported to the United States from Canada and Mexico. Trump announced his tariff plan after alleging that "thousands of people are pouring through Mexico and Canada,

Threats by President-elect Donald Trump to impose U.S. tariffs on its immediate neighbors appear to have created a split between Canada and Mexico, after Canadian officials said problems with the two countries' borders were not comparable.

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.