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President Donald Trump on Monday ordered 700 Marines to Los Angeles to defend federal law enforcement officers and property and doubled the number of National Guard troops deployed there since Saturday. Those moves amplified the standoff between the federal government and California officials, who say the deployment of the military to quell relatively small protests was unnecessary, inflammatory and a breach of foundational American law and policy that the military is not to be used domestically – except in rare instances. California sued the Trump administration on Monday evening to stop its deployment of National Guard members.

There are a few arcane laws that give the president the legal right to deploy military troops on U.S. soil, but it has been done only a handful of times in U.S. history − and always with the aim of protecting Americans. I asked William C. Banks, a scholar of the military’s role in domestic affairs, whether there are any legal roadblocks that could stop the president from sending U.S. troops to Los Angeles.

“The short answer to this question is no,” Banks said.

In today's top story, Banks explains the legal basis for deploying American troops on American soil and why “it has rarely been done in the U.S. as a way of responding to a civil disturbance.”

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Amy Lieberman

Politics + Society Editor

National Guard members watch protests in Los Angeles on June 9, 2025. Luke Johnson/Los Angeles Times via Getty Images

Trump orders Marines to Los Angeles as protests escalate over immigration raids, demonstrating the president’s power to deploy troops on US soil

William C. Banks, Syracuse University

American troops may be used inside the country, but it is an extraordinary exercise of authority to deploy them domestically, says an expert on the domestic role of the military.

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