Imagine Trump deciding he had to invoke emergency powers to maintain order and delay the Biden inauguration indefinitely. Hitler 2.0. Chilling
He doesn't. It would need SCOTUS to determine he did.
The US constitution is very clever. It was deliberately written by people who had either lived through insurrection or tyranny, or had closely studied the history of nations and empires ( especially the Roman empire - all 1,500 years of it's existence) that had all endured the same.
However, it is only as strong as the people in the positions it creates to defend it. If they are weak, corrupt, criminal, or just plain evil, then they need to be removed. If they aren't (because it's "too hard") then eventually the constitution becomes meaningless.
At least one founding father was less optimistic about the US future. Jefferson felt that eventually all regimes fail and need to be renewed by violent insurrection.
And while the US constitution is very clever, it's also full of shit. Only on planet America can you condemn cruel and unusual punishments in the same breath as delivering the death penalty. It's almost as crooked as "all men are created equal" (oh, except for those funny colored ones - they're 3/5ths of a white man donchaknow).