LOS ANGELES — The Trump administration must remove California National Guard troops from Los Angeles by Monday, a federal appellate court ruled. The decision upheld a lower court order that halted the mobilization that had roiled the nation’s second-largest city for six months.

The ruling late Friday by the 9th U.S. Circuit Court of Appeals substantially upheld a district court decision from this past week that found the federal government had illegally prolonged the military presence in Los Angeles months after intense protests over immigration enforcement had died down.

The decision by the three-judge panel of the 9th Circuit effectively blocked the Trump administration from using the remaining 100 or so National Guard troops in California — at least, for the moment.

But the appellate

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