shrug
At that moment it is less about law than it is about character of other leaders. Does the Vice President, who is still the VP following his own election loss, contradict the POTUS' election fraud claims and call for violence? Necessarily on the table is 25th amendment and/or impeachment. A call for violent revolution to achieve the dissolution of constitutional order is unquestionably a violation of oath of office for any elected official.
People are conditioned to think that an impeachment would take a week or more. If Congresscritters actually get scared? They can follow strict rules of order and still get it done very quickly. Hours. The real impediments to speed are physical presence in the chamber. Not opposition. They will not wait for TV cameras, spectator chairs or tickets to get printed. If they really believe the POTUS is trying to incite an overthrow of the government, which is what autocracy means, they know full well they are inside the blast radius of imploding power.
IF a POTUS can use force to stop them, it is extra-constitutional, and at that point this person is not POTUS but something else.