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.

MEXICO CITY (AP) — President Claudia Sheinbaum suggested Tuesday that Mexico could retaliate with tariffs of its own, after U.S. President-elect Donald Trump threatened to impose 25% tariffs on Mexican goods if the country doesn’t stop the flow of drugs and migrants across the border.