A federal judge ruled Tuesday that President Donald Trump's deployment of National Guard troops to Los Angeles, amid immigration enforcement and protests against the raids, was illegal.

Judge Charles Breyer of the U.S. District Court in San Francisco issued the ruling, finding that the deployment was in violation of the Posse Comitatus Act, which bars most uses of U.S. troops on U.S. soil.

It is unlawful for U.S. military troops to enforce domestic laws. The Trump administration has argued that the troops were there to protect federal officers and property and they were not performing local policing duties.

An appeal is expected from the Trump administration.

The ruling, which followed a lawsuit by California Gov. Gavin Newsom, goes into effect on Sept. 12.

Trump deployed 4,000 Nati

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