President-elect Trump said he spoke with Mexican President Claudia Sheinbaum Pardo and said she had agreed to “stop migration through Mexico and into the United States” after threats this week to stop imports of goods from to ban the southern neighboring country from entering the USA with significant tariffs.

Trump said he would impose 25% tariffs on Mexico and Canada if both countries did not do more to stop the flow of illegal immigrants and drugs into the United States. Sheinbaum, who recently took office, said Wednesday that Mexico would retaliate if Trump followed through on his promises.

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President Claudia Sheinbaum (left) President-elect Donald Trump (right) (Getty Images)

“If there were U.S. tariffs, Mexico would also increase tariffs,” she said during a news conference.

On Wednesday, Trump said he had spoken to his Sheinbaum about the matter.

“Just had a wonderful conversation with the new President of Mexico, Claudia Sheinbaum Pardo,” he wrote on Truth Social. “She has agreed to stop migration through Mexico and into the United States, effectively closing our southern border. We also talked about what can be done to stop the massive influx of drugs into the United States and also the US consumption of these drugs. It was a very productive conversation!”

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Claudia Sheinbaum, former mayor of Mexico City and Morena Party presidential candidate, during a campaign launch event in Mexico City, Mexico, on Friday, March 1, 2024. Sheinbaum launched her campaign with a series of proposals to expand social programs that underpins the popularity of the current president and portrays herself as someone who would build on her legacy. (Victoria Razo/Bloomberg via Getty Images)

In a later post, he said: “Effective immediately, Mexico will stop people from coming to our southern border. This will go a long way in stopping the illegal invasion of the USA. Thank you!!!”

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Trump has long complained that Mexico has not done enough to stop the flow of migrants and illegal drugs on its side of the southern border.

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“This will support migrants and caravans before they reach the border,” she wrote. “We reiterate that Mexico’s position is not to close borders, but to build bridges between governments and between peoples.”

Trump also threatened to impose an additional 10% tariff on China on the huge quantities of fentanyl entering the United States from Mexico.

U.S. officials have frequently said that illegal fentanyl is being manufactured in Mexico Chinese forerunners and then smuggled across the border by drug cartels.

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Fentanyl, a synthetic opioid that is up to 50 times more powerful than heroin and can be fatal in small doses, has killed hundreds of thousands of Americans and is a factor in many drug overdose deaths.

On Wednesday, Trump said he would work on a major advertising campaign to educate about the dangers of fentanyl.

“Millions of lives are being destroyed so needlessly. When the campaign is over, everyone will know how terrible the horror of this drug is,” he said.

In response to the threat of more tariffs, the Chinese Communist Party-run newspaper China Daily published an editorial on Tuesday saying, “The president-elect has used a far-fetched excuse to justify his threat of additional tariffs on imports from China.” said Reuters.

Fox News Digital’s Greg Norman contributed to this report.