A federal judge ruled the Trump administration's use of the California National Guard is illegal, and this decision could have ramifications in other big cities across the country.

Since June, the California National Guard has been under federal control, activated by President Donald Trump. At its height, 4,000 Guard members and 700 Marines were on the ground in southern California.

But Tuesday, Judge Charles Breyer ruled the Trump administration's use of troops in the Los Angeles area violates federal law. His decision centers on the Posse Comitatus Act, which prohibits the military from being used for domestic law enforcement purposes.

"We don't want the military acting as a national police force. So to the extent that the military was doing those things, like setting up perimeters an

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