(CNN) — A federal judge ruled Tuesday that President Donald Trump and Defense Secretary Pete Hegseth violated federal law by using the US military to help carry out law enforcement activities in and around Los Angeles this summer.

US District Judge Charles Breyer concluded that Trump’s use of thousands of federalized California National Guard members and US Marines to provide protection to federal agents during an aggressive immigration crackdown in the Los Angeles area ran afoul of the Posse Comitatus Act, a 19th Century law that generally prohibits the use of troops for domestic law enforcement purposes.

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