As President Donald Trump pushes the bounds of military activity on domestic soil, a debate has emerged over a nearly 150-year old law that regulates when federal troops can intervene in state issues.

About 800 National Guard troops filed into Washington, D.C., on Tuesday after President Donald Trump said — without substantiation — that they were needed to reduce crime in the “lawless” national capital. Thousands of miles away, a judge in California is hearing arguments about whether the president's recent decision to federalize Guard personnel in Los Angeles during protests against immigration raids violated federal law.

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