WASHINGTON — President Donald Trump's move to send National Guard troops and Marines to Los Angeles amid unrest over his immigration policies has given new weight to a lingering question: How far can a president go in using the military to quell domestic disturbances? For now, the military has a limited role in Los Angeles, focused on protecting federal buildings and activities, but that hasn't stopped California's Democratic leaders, including Gov. Gavin Newsom, from vehemently objecting to Trump's actions.

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