Mr Trump could take a more far-reaching step by invoking the Insurrection Act of 1792, which would allow troops to directly participate in civilian law enforcement, for which there is little recent precedent.
Casting protests as an “insurrection” that requires the deployment of troops against US citizens would be riskier legal territory, one legal expert said, in part because mostly peaceful protests and minor incidents are not the sort of thing that the Insurrection Act were designed to address.
Found another possibility …
https://www.straitstimes.com/world/united-states/does-us-law-allow-trump-to-send-troops-to-quell-protests