President-elect Donald Trump filed an amicus brief late Thursday backing a legal effort by Texas and Missouri to “immediately” halt the Biden administration’s sale of border wall materials, calling the action “possibly criminal.”

Earlier this week, Texas and Missouri filed a motion in the Southern District of Texas requesting a status conference to assess whether the government is violating a permanent injunction issued earlier this year. The injunction prohibits the Biden administration from using funds allocated for wall construction for any other purpose.

“The Court should issue an order directing the Defendants to immediately stop any ongoing sale of border-barrier materials to private parties pending the Court’s review of Defendant’s conduct, and the Court should swiftly conduct a searching examination of the Government’s conduct, by formal discovery if necessary, to examine the Government’s compliance with the law, the Constitution, and the Court’s injunction,” Trump’s amicus brief states, according to Fox News.