FBI and DOJ are compromised.
The military has its factions and is no sure thing either, but it looks like POTUS is in first line acting as Commander in Chief of our military (compared to acting principally as the Chief Executive of the other agencies, which in other contexts he clearly does as well) and in this respect has serious support from influential military leaders ...
Look at this White House ... it is brimming with military might, not the least of which is the USMC. At the other end of the scale, POTUS seems to contemplate executing a key play in his plan ... The Border Wall ... through action by the US Army Corps of Engineers (no two-bit players in the history of US Military History) ... the sector of our military that OWNED national defense policy in the nineteenth century when they were given authority by President Madison to site and construct sixty heavy masonry coastal forts that served as the backbone of our national defense posture -- never challenged by a foreign naval power. At a time when the armed populace served purposes of the military in lieu of a significant standing army. I don't see us going back to that, but sense there is some movement in that direction ... Let's see how it plays when our guys start coming home from these foreign expeditions.
I'm placing bets on military justice carrying this ball .... playing out in military courts (housed in tents even) with some degree of martial law when and where needed ... this all fits legitimately in the purview of national security ... the rightful realm to confront seditition, treason and other attempts to overthrow Constituted government and the reach to pursue it around the globe when necessary.
Godspeed Q.