It's only a matter of time. I believe I'd read that ICE will soon be deployed in New Orleans. Partially to punish/"clean up" the city, but also because it's easy to justify and then allows easy and "justifiable" expansion to Houston, so that they can get a foothold here in Texas. Likely, they'd go from there to Austin, and probably here in San Antonio, and then make their way to Dallas. Dallas will give the agents a little treat, since so many of the citizens will laugh at immigrants while getting their own throat crushed by a boot.

From there, it's a simple stone's throw to Oklahoma.

I think the cities being chosen right now are partially because Trump gets to feel like a big boy dictator attacking his enemies, but primarily to get other cities on board with being invaded. They'll just tell themselves that ICE is a necessary evil presence if they wanna see other people get punished.