There have been several who have hinted that "martial law" may be an option they've been looking toward (as well as "just happening" to have another on-soil attack), hence the recent "strong resolution" passed by Congress that the elections would NOT be postponed. The suddenness of the resolution and it's quick passage may have been a "hint" on several levels that certain "exercises in authority for the good of the people" wouldn't be stood for.
...I suspect that we're spread too thin for such a thing to occur; the folks who'd holler the loudest would be the Survivalists and NRA members, but they'd likely have a huge portion of the general public charging the gates of Crawford (or that other Presidential palace) before enough of the soldiers could be dragged home.
And, I suspect not a few of the commanders would pitch in to put a stop to the fallacy. Hopefully, not by direct armed conflict (like a second Revolution or Civil War), but - that depends entirely on what card(s) the Administration plays in order to retain power. They don't seem to want to do that without a fight. (I think, partly, 'cuz the investigations that would promptly follow their departure would land them in World Court and Federal Prison pretty quickly).
But that's just my rather soured opinion...