President Donald Trump says he's deploying 2,000 California National Guard troops to Los Angeles to respond to immigration protests, over the objections of California Gov. Gavin Newsom.

This time, however, Trump is acting in opposition to Newsom, who under normal circumstances would retain control and command of California's National Guard. While Trump said that federalizing the troops was necessary to “address the lawlessness” in California, the Democratic governor said the move was “purposely inflammatory and will only escalate tensions.”

Here are some things to know about when and how the president can deploy troops on U.S. soil.

The laws are a bit vague

Generally, federal military forces are not allowed to carry out civilian law enforcement duties against U.S. citizens except in ti

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