What can be fought, and yet no one is pointing out, is Trump saying "take their oil." How can that possibly be done without an occupying army? Beam it up, Trumpie? They aren't going to give it freely and its not possible to take it surgically. Sabotaging any attempt to take it would be easy. It should be much easier to hit Trump over this than his "Mexico will pay for the wall."
Well, there are a variety of ways I can think of to do that. It might require occupying something as small as the pumping port in the south (forget the name after all these years). You can deal with locals as the Brits did with the Saudis for years. Or you can simply deny it to them.