Which? The State national guards? The "well-regulated militia?"
The President is Commander in Chief of the US armed forces.
The president can take over command of state national guards from governors, however they are bound to defend the constitution just like the others and ought to obey unconstitutional attempts to give them orders.
Yes, if it keeps escalating. We're going to make bloody monday look like a kid scraped his knee. Depending on the escalation, we may even make the first Civil War look tame in comparison.
That's pretty much the fate of all dictators: a coup.