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This is strictly a hypothetical question, not a realistic question. It also is not a conspiracy theory of what is likely to happen. It is a political War Game scenario, but instead of dealing with hostile foreign governments such as Russia, China, Turkey, or North Korea, the question is about dealing an domestic hostile takeover attempt by a political party, the GOP.
Scenario: Before Jan 20th Donald Trump has a dead serious TV state-of-the-nation address (and world) where he states he is declaring Martial Law. As president he openly declares he is postponing indefinitely all elections and election results. Declares all branches and states are to report directly to him, including all law enforcement, and the entire military. Congress and the Supreme Court would be under his direct control and must seek his final approval on all issues.
Justification: He would frame Martial Law as a "temporary state of emergency", but necessary because of COVID and because of election fraud. He would attempt to put people at easy by saying "It will only be for a very short period of time, not long, just long enough to make America great again" and he, Donald Trump, would decided when to it would be safe to lift Martial Law restrictions.... But of course, that day would never come while he remains in power.
This hypothetical question is not about what Donald Trump can legally do, its about him attempting stay in power claiming his has authority and power as president to use emergency powers to stay in power. And the scenario questions how willingly the GOP would be to back him up because they would also stay in power with him. In this scenario, there would be 10's of millions of Americans that would would instantly support such move by Donald Trump, and support the increasing crack downs that would follow.
Would the GOP go along with this scenario under the self-delusion that it is justified and just temporary?
How long would the majority of Americans accept Donald Trump having complete authoritarian power over everything? Not a single day? A week? A month? Until COVID is under control? Until Donald Trump decides otherwise?