Mexican officials have been negotiating for months in hopes of reaching a trade deal with Washington that would not devastate the country’s export-driven economy, but President Trump upended those talks on Saturday when he threatened to impose a 30 percent tariff on Mexican imports, potentially igniting a trade war with one of America’s largest trading partners.
In a letter to Mexico’s president, Claudia Sheinbaum, Mr. Trump said that Mexico was not doing enough to curb the flow of fentanyl into the United States and cited that as the reason for the tariffs. Mr. Trump added that Mexican companies were welcome to manufacture their products in the United States to avoid the tariffs.
The tariffs are set to take effect on Aug. 1 and are similar to the levies that the United States is imposing on imports from Canada and the European Union, which Mr. Trump said separately on Saturday would also face 30 percent duties. The tariffs come despite the fact that Mr. Trump brokered a trade deal with Mexico and Canada during his first term that was intended to stabilize economic relations between the United States and its neighbors.
Mr. Trump also warned Mexico not to retaliate with higher tariffs of its own. He said that whatever additional tariffs Mexico might impose would be added to the 30 percent rate he announced.
The president added that drugs were not the only issue of concern to the United States and pointed to other Mexican policies that contributed to “unsustainable” trade deficits.
“The Trade Deficit is a major threat to our Economy and, indeed, our National Security!” Mr. Trump wrote in the letter.
Mr. Trump has been going back and forth on tariffs on Mexico for months.
In March he announced plans to impose a 25 percent tariff on Mexican imports. Mexican officials warned that the import tax would cause food shortages in the United States and called it a “strategic mistake.”
Later, he exempted goods that trade under the United States-Mexico-Canada Agreement, the trade pact Trump negotiated in his first term. Currently, because of that U.S.M.C.A. exemption, about 87 percent of Mexican exports to the U.S. trade tariff free, according to data from the Mexican government.
It remains unclear whether the tariffs that Mr. Trump is now threatening to impose on Mexico may continue to include exemptions for those goods. The White House said no final decision had been made.
American car factories also rely on Mexico for parts, and economists said in March that the auto and electric equipment sectors in Mexico would be most exposed to disruption if tariffs were enacted.
The Mexican economy minister, Marcelo Ebrard, who is leading a Mexican delegation in Washington to discuss issues on border security, migration and trade, said U.S. officials told their Mexican counterparts that, “as part of the profound change in the United States’ trade policy,” the Trump administration was going to send letters to all world leaders announcing new tariffs.
“We mentioned at the negotiating table that it was an unjust move and that we did not agree with it,” Mr. Ebrard said in a statement posted on social media on Saturday.
Mexican officials said that they would work to ensure that, before the new tariffs take effect on Aug. 1, “we have an alternative that allows us to protect businesses and jobs on both sides of the border.”
Emiliano Rodríguez Mega contributed reporting from Mexico City.
Alan Rappeport is an economic policy reporter for The Times, based in Washington. He covers the Treasury Department and writes about taxes, trade and fiscal matters.
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