What happens if the organs of government have become compromised, infiltrated, or controlled by a foreign power of some sort? How does the military fight that sort of opponent, one who buys judges and congressmen and president’s sons rather than invading with tanks and ships and soldiers in uniform? The US government and military considered this back in the 40s and 50s, and they have a plan for that. Here is a series of posts talking about the theory that that plan, called “devolution” (the opposite of “evolution”), where power devolves from the comped president to the military to take care of business and get things straightened out, then restore the proper president.
The series starts here. Links to the rest are at the bottom of each article. Six parts in all.