There is. “Posse Comitatus” forbids use of American troops against civilian populations. If they got away with that then
what do you think they’d do now? (Posse etc. means “Power of the County”. Little known fact but as ex-deputy ex-cop I learned the County Sheriff, unless otherwise provide by an amendment, has complete legal power in the County he’s elected to. Trivia: County Sheriff only one with power to arrest a sitting Governor.
Who has the power to arrest a sitting president? A U.S. Marshall? (I can dream...)
” I learned the County Sheriff, unless otherwise provide by an amendment, has complete legal power in the County he’s elected to.”
Goes farther than that. Sheriff Mack in Arizona (I believe) sued the federal government and the USSC ruled in 1997 that the feds cannot require local officials to carry out the mandates of federal law. During Katrina, a couple of sheriffs posted armed guards to keep the FEMA gun grabbers out of their counties.
Another federal judge in Utah ruled that county commissioners and Indian tribes can pass specific laws nullifying regulations imposed by the federal
fascist bureaucracies.