CBS’s Margaret Brennan brought Border Czar Tom Homan on to Face the Nation to discuss the recent ICE shootings, among other matters. And as is often the case, Brennan got schooled.Watch as Homan shuts Brennan down over vehicle markings, lights, and agent identification: WATCH: Tom Homan shuts down Margaret Brennan over ICE vehicle stopsTOM HOMAN: My concern is I think a lot of the rhetoric that you see every day, especially in sanctuary cities and at these …