The Supreme Court instructed the 5th US Circuit Court of Appeals to swiftly address unresolved issues in the case.
Confusion reigns at the border due to back-and-forth court orders and limited communication from Texas officials.
The Biden administration has opposed the law, arguing it undermines federal authority over immigration policy.
Texas asserts its right to defend against illegal immigration citing constitutional provisions.
Justices Barrett and Kavanaugh suggest Supreme Court intervention was premature, given ongoing litigation in the 5th Circuit.
Mexico rejects the Supreme Court's decision and refuses repatriations from Texas.
The case is titled United States v. Texas, 23A814.