@nerese My suspicion is that this Republican senator was holding all the top military positions empty so that if Trump were to win a election, he could fill them with his acolytes so that, if anything jeopardized his power – riots in Portland, protests in DC, or even people simply telling him to leave when his term's up – they would obey his orders to turn the military against the American people.
I think they're dreaming if they believe the US military would do that, but who the hell knows any longer? But it's not that I think his plan would be successful, it's that I think it's incredibly troubling he has such a plan at all.