This is how he brought Kim Jong-un to the negotiating table: essentially pretending "I'm more crazy than you" so his opponents back down. Remember his "fire and fury" statement.
The corrupt establishment claims "we're the crazy ones, look how we blatantly rigged this election!" but Trump is countering with, "No I am. Look how I'm re-structuring the pentagon with loyalists. Maybe I'm even willing to use the military to block Biden's confirmation if it comes to that."
I don't believe he would throw our nation into civil war, but the corrupt establishment he's fighting against are afraid. They will back down and start throwing each other under the bus as soon as the tide turns. It's just a matter of who blinks first, and Trump doesn't blink.
Brinksmanship is the word your looking for and he does it well