President-elect Donald Trump filed a blockbuster legal motion on Friday to stop President Joe Biden from making a final move in office that the Republican argued would compromise the country’s safety and lead to another significant influx of illegal immigrants.

Fox News reported on an amicus brief filed by Trump’s lawyers on Friday as part of a lawsuit to stop the Biden-Harris administration’s privatization of the border wall separating the United States from Mexico, joining Republican attorneys general in Texas and Missouri as they challenge whether the president violated a court order in moving to do so. The sale, Trump argued, is “possibly criminal.” The filing adds, “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.”