"I am pleased to inform you that The United States of America has reached a signed agreement with Mexico," he tweeted. "The Tariffs scheduled to be implemented by the U.S. on Monday, against Mexico, are hereby indefinitely suspended. Mexico, in turn, has agreed to take strong measures to stem the tide of Migration through Mexico, and to our Southern Border. This is being done to greatly reduce, or eliminate, Illegal Immigration coming from Mexico and into the United States. Details of the agreement will be released shortly by the State Department. Thank you!"
Trump announced earlier this month that beginning on June 10, a 5% tariff would be imposed on all goods coming into the U.S. from Mexico "until such time as illegal migrants coming through Mexico, and into our Country, STOP."
However, as part of that deal, it appears the U.S. did not get Mexico to agree to a "safe third country" agreement where asylum seekers would be granted asylum in Mexico and unable to claim asylum in the U.S. Instead, the administration says it will expand its policy of deporting asylum seekers to Mexico to await adjudication of their cases. Mexico will accept those people and offer them services like health care and education.
That policy is currently being contested in federal court, although the Ninth Circuit ruled that the administration could implement as a final determination is reached.