I'm not so sure it's civility politics that is limiting him here. I doubt this nakedly corrupt and partisan court would actually side with his administration when it comes to agreeing that his acts are indeed official. Especially if said acts don't fit with the Federalist Society's ideology.

If he doesn't get re-elected that's a different story, and he is realistically too old to face major consequences for his actions... so it would be great if he would at least have special forces rough these guys up a little bit to make a point about the necessary limits on executive power.