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.

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.

Trump said Monday on Truth Social that one of his first executive orders would be to hit Mexico and Canada with a blanket 25% tariff. Mexico and Canada are the second and third top suppliers of goods to the U.S., according to the Office of the U.S. Trade Representative. The U.S. imports the most goods from China.

The leader of Canada's most populous province on Tuesday called Trump’s comparison of Canada to Mexico “the most insulting thing I’ve ever heard.”

Trump's tariff threats have led to a division between Canada and Mexico regarding border security, highlighting differing challenges each country faces.

The president-elect said he intends to levy a 25% tariff on goods imported from Mexico and Canada until drugs and undocumented migrants stop crossing the border.