BackFire
Blood. It's nature's lube
Unfortunately I tend to agree with darthgoober on this.
I think if ever a president was sincerely going to attempt to take full control of the government in a totalitarian manner he would be slow and methodical about it and instill people in charge of the military that he knows would be subservient to him. In which case you'd have to rely on some low level soldiers to buck orders and overthrow not just the president but also the military leadership. In which case, I think most would just follow orders.
Then again, you guys were specifically talking about Trump doing this, which is probably the exception. If ever he did it, it would probably be on a whim without any planning and end up getting overthrown within 15 minutes by a white house intern.