Federal prosecutors in Tennessee on Monday asked a magistrate judge for a pre-trial detention hearing in the human smuggling case against Kilmar Abrego Garcia, after he was brought back to the U.S. on Friday to face charges.

The Maryland man, whose erroneous deportation to El Salvador became a protracted battle over due process and a test of wills, will face human smuggling charges in Tennessee.

The case is a political flashpoint in the administration’s stepped-up immigration enforcement. Now it returns to the U.S. court system, where Abrego Garcia appeared Friday after being returned from El Salvador.