The Posse Comitatus Act of 1878 prohibits the president from using the military as a domestic police force.

The military protects the Constitution, not the president. The Secret Service requests local and state Police help for all presidential visits. There were plenty of articles whining about the cost of Trump's visits during his term, and calls for him to reimburse the cities that he visited.

EDIT - interestingly enough, the Dept. of Homeland Security (under Trump) created a budget for reimbursing these costs. Years 2018 - 2020 each saw a budget of $41 Million (again, Trump's years) then starting in 2021 (begin Biden's term) the support drops to $3 Million. Very curious.

The Posse Comitatus Act of 1878 prohibits the president from using the military as a domestic police force.

The military protects the Constitution, not the president. The Secret Service requests local and state Police help for all presidential visits. There were plenty of articles whining about the cost of Trump's visits during his term, and calls for him to reimburse the cities that he visited.