SAN FRANCISCO — National Guard troops repeatedly rehearsed their role in an operation at a Los Angeles park intended as a show of force against undocumented people and those protesting the Trump administration's immigration crackdown, a deputy commanding general testified Tuesday.

Maj. Gen. Scott Sherman, who commanded Guard troops in Los Angeles, was testifying at a trial to determine whether the Trump administration violated the Posse Comitatus Act when it deployed the soldiers and U.S. Marines to Southern California this summer. The 1878 law generally prohibits a president from using the military to police domestic affairs.

Sherman said the deployment of federal agents on horseback and on foot to MacArthur Park in a neighborhood with a large immigrant population was initially planned

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