A federal judge in San Francisco ruled that President Donald Trump’s deployment of U.S. troops to Los Angeles earlier this summer violated a law barring the military from acting as domestic police.

In a ruling issued Tuesday, Judge Charles Breyer concluded that the Trump administration broke the Posse Comitatus Act of 1878, which prohibits the use of the military to enforce civilian law without congressional approval. Breyer found that Marines and National Guard soldiers stationed in Los Angeles this June were ordered to carry out policing functions during protests against the Trump administration’s immigration policies. The rebuke from Breyer comes as Trump signals he may send troops into other blue cities.

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“Congress spoke clearly in 1878 when it passed the Posse Comitatus Act,

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