President Claudia Sheinbaum of Mexico also said Donald Trump was ill-informed when he said Mexico was “essentially run by the cartels.”

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Donald J. Trump has said that Mexico is allowing an “invasion” of migrants into the United States. But the current situation on the ground tells a different story: Unlawful crossings at the U.S.-Mexico border dropped sharply last year.

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Could a tariff war erupt between the United States and Mexico? A top Mexican official said his country might retaliate if the Trump administration placed steep tariffs on Mexico.