A federal judge on Thursday blocked a new Texas law that gives police broad powers to arrest migrants suspected of illegally entering the U.S., dealing a victory to the Biden administration in its feud with Republican Gov. Greg Abbott over immigration enforcement.

The preliminary injunction granted by U.S. District Judge David Ezra pauses a law that was set to take effect March 5 and came as President Joe Biden and his likely Republican challenger in November, Donald Trump, were visiting Texas’ southern border to discuss immigration. Texas officials are expected to appeal.

Opponents have called the Texas measure the most dramatic attempt by a state to police immigration since a 2010 Arizona law that opponents rebuked as a “Show Me Your Papers” bill. The U.S. Supreme Court partially struck down the Arizona law, but some Texas Republican leaders, who often refer to the migrant influx as an “invasion,” want that ruling to get a second look.