The Supreme Court has allowed Texas to implement a law that allows state police to arrest immigrants on state, not federal, charges if they illegally enter the United States from Mexico, marking a blow to the Biden administration’s bid to block it.

The high court’s 6-3 decision comes just one day after it ruled to continue a temporary hold that was initially issued on March 4. Justice Samuel Alito, who covers matters stemming from the U.S. Court of Appeals for the 5th Circuit, led the order but did not explain his reasoning.