President Donald Trump threatened Thursday to immediately double tariffs on Mexican goods if the country fails to stop migrant caravans heading toward the U.S. border.

In a Truth Social post, Trump linked the new movements to what he called a perceived Republican loss in last week's midterm elections, which handed Democrats control of Congress. He wrote that "huge CARAVANS are forming and beginning their illegal march through Mexico" and that many participants come from countries that "don’t want" them.

"MEXICO MUST STOP THEM, NOW, and if they do not do so, the Tariffs on Mexico will be IMMEDIATELY DOUBLED," Trump stated. He added that Mexican authorities, the Texas governor, Border Patrol, and ICE had been notified, and declared there would be "no leniency."

An estimated 1,500 migrants, mostly families from Central America, departed Tuesday from Tapachula near the Guatemala border. The group, sometimes called the "Dios con Nosotros" caravan, hopes Democratic gains might ease entry into the United States.

Mexican President Claudia Sheinbaum responded that no migrant caravans have reached the U.S. border since Trump returned to office in January 2025. She said authorities informed participants of the difficulties ahead and that one smaller group had largely dispersed.

Homeland Security Secretary Markwayne Mullin posted that the caravan would not be allowed to enter the country. The threat arrives amid ongoing U.S.-Mexico trade talks and a Supreme Court ruling that limited presidential tariff authority.

Trump has repeatedly emphasized border security as a core priority during his current term.