Fox News reports that President Trump threatened to immediately double tariffs on Mexico if it fails to stop migrant caravans marching toward the U.S. southern border. "Huge CARAVANS are forming and beginning their illegal march through Mexico," he wrote in a Thursday morning Truth Social post. He added that other countries do not want many of the people in the caravans and that they will not be accepted.

Trump wrote that Mexico must stop the caravans now, and that if it does not, the tariffs on Mexico will be doubled at once, Fox reports. He said Mexico, the new governor of Texas, the Border Patrol and ICE had all been informed, and that there would be no leniency. The post opened by tying the caravans to the midterm results, Fox reports, with Trump saying the perceived Republican loss had set off a new invasion of the country and noting he was not on the ballot.

The caravan, an estimated 1,500 people mostly from Central America, set off Tuesday from Tapachula, a southern Mexican city near the Guatemala border, according to Fox.

Fox also reports that Texas Attorney General-elect Nathan Johnson, a Democrat, could drop the state's defense of SB4, a Republican-backed law that lets Texas authorities arrest and prosecute people suspected of crossing the border illegally. The Fifth Circuit Court of Appeals allowed that law to take effect in April while a challenge proceeds. In a separate matter, Fox says the Supreme Court is weighing whether to take Iowa's appeal of a ruling that blocked a similar state law, and Iowa's Democratic attorney general-elect, Nate Willems, could decline to defend it.