Judges in Texas and New York have temporarily barred the U.S. government from deporting Venezuelans jailed in parts of those two states while their lawyers challenge the Trump administration’s use of a rarely invoked law letting presidents imprison and deport noncitizens in times of war.

The decisions suggest that the battle over using a wartime law, the Alien Enemies Act, to deport migrants is certain to persist.

March, the Trump administration sent more than 200 alleged members of a Venezuelan gang to El Salvador, using an archaic wartime law to deport many of them without any legal review or due process.