Mexican President Claudia Sheinbaum says that the incoming U.S. president’s plan to institute massive tariffs on Mexican imports would bring about mutually assured economic destruction.

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% import duties on Mexican goods if the country doesn’t stop the flow of drugs and migrants across the border.

President Claudia Sheinbaum responded to President-elect Trump’s threat to impose high tariffs, saying such a move would inflict damage on both countries.