I think that Trump would make a real attempt to criminally prosecute Democratic leaders, as well as Republicans that won’t go along with him. Since the president now has immunity for ‘official acts’, he would have no real roadblocks for dealing with things in an extrajudicial way, and it’s unlikely that anyone that he appoints is going to make any attempt to slow him down; almost everyone that’s served in his prior administration has already said as much.

If he wins, I expect things to be very bad for much longer than his official, legal term of office. He’s going to do everything he can to eliminate the rule of law, and SCOTUS has already demonstrated that they can’t/won’t block him.