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.

Mexico and Canada are the United States’ top two trading partners, accounting for nearly 30% of trade volumes.

Donald Trump’s threat to impose tariffs on goods from Canada and Mexico could upend current U.S.-Mexico cooperation on immigration.