Trump said in a post to Truth Social on Monday 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.

President-elect Trump has put the country’s top three trading partners on notice less than two months before he takes office. The former president threatened Monday to impose steep 25 percent tariffs on all goods from Canada and Mexico — two key U.

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.