A federal judge on Monday blocked a California law from going into effect that would ban federal immigration agents from covering their faces, but they will still be required to wear clear identification showing their agency and badge number.

California became the first state to ban most law enforcement officers from wearing facial coverings under a bill that was signed in September following the summer of high-profile raids by ICE officers in Los Angeles.

The Trump administration filed a lawsuit in November challenging the laws, arguing that they would threaten the safety of officers who are facing harassment, doxing, and violence and that they violated the constitution because the state is directly regulating the federal government.

Judge Christina Snyder said she issued the initial ruling because the mask ban as it was enacted did not also apply to state law enforcement authorities, discriminating against the federal government. The ruling could have national implications as states grapple with how to deal with federal agents enforcing the Trump administration’s immigration crackdown.

It left open the possibility to future legislation banning federal agents from wearing masks if it applied to all law enforcement agencies, with Snyder writing “the court finds that federal officers can perform their federal functions without wearing masks”. The ruling will go into effect 19 February.