They’re in a pissing match. The relationship between SpaceX and the federal government is mutually beneficial. I would be surprised if either follows through on their threats.
It hasn’t. A former advisor, Steve Bannon, suggested it while also suggesting they deport Elon. It is clearly just a swipe at Elon and not “Trump admin” seriously suggesting this.
DoD has now and has always had ultimate authority when it comes to putting things into the space above our heads. Don’t listen to the idealistic millennials and their powerful downvote buttons. ;)
I don't know if they seriously want to do it, but whether they can do it is up to a highly sympathetic SCOTUS.