A federal judge asked for briefings from both sides on whether the Posse Comitatus Act, which prohibits troops from conducting civilian law enforcement on U.S. soil, is being violated in Los Angeles.

The decision blocks a lower-court order that found the president exceeded his authority by federalizing state forces in response to protests.

The federal appeals court’s ruling was a win for President Donald Trump as he aims to use the military to police protests of his deportation efforts.