For John, BLUF: The Rhetoric is getting too hot, too fast. Nothing to see here; just move along.
President Obama on Tuesday said Mr. Trump was “unfit to serve as president”.
So, what, in President Obama's mind, does that mean?
The "coup" idea is not new. On 20 July, in The LA Times, Mr James Kirchick had "If Trump Wins, a Military Coup 'Isn't Impossible'".
And for scholarly papers, here is Law Professor Glenn Harlan Reynolds (University of Tennessee) and "Of Coups and the Constitution".
Abstract:Regards — Cliff
Military coups d'etat are a relatively common means of government turnover in many countries, but not in the United States. This paper looks at a number of factors in the United States' Constitution and political culture that make military coups less likely, as well as at some changes in both that may reduce the degree of protection. It also offers some suggestions on how to ensure that Americas coup-resistance remains strong.