If President Trump does use the military to quell protests, he’ll likely rely on the same law used to aid the Civil Rights movement

After a week of both peaceful protests and violent chaos in the wake of George Floyd’s death, President Donald Trump announced, “If a city or state refuses to take the actions that are necessary to defend the life and property of their residents, then I will deploy the United States military and quickly solve the problem for them.”

Is Trump’s warning just bluster? Does the president have the authority to send the military into American cities?

The answer to this question involves a web of legal provisions that help define...