Legal experts say the president does indeed have the authority under the Insurrection Act of 1807 to dispatch the military in states that are unable to put down an insurrection or are defying federal law.
Under the law, Trump would first have to proclaim that the insurgents disperse and retire peaceably within a certain amount of time.
He said the Insurrection Act had not been used since 1992, partly because of the unpopularity of using troops for domestic purposes.
And its hard to imagine courts second-guessing factual determinations by the President that circumstances warrant use of the military to restore order, Vladeck wrote.
The president is not asserting the right to enforce federal law.