So they just do it without an amendment. Who’s gonna stop them? The SCOTUS which has declared that Trump isn’t bound by law while president? The people, who happily voted Trump into power after he tried to overthrow the previous government? Congress? The military?

Maybe one of them will, but I would be very anxious these days if I lived in the US.

You’re asking this as if the majority of congress isn’t fully behind the Trumpist authoritarian agenda.