Well, I caught a snippet of his show last night and he mentioned something about Ron Paul being on the show today. He said something about he's going to ask Dr. Paul why shutting down the FBI is a good idea. He had a slightly condescending tone, so I'm sure he's going to be sarcastic during the interview, but I still doubt he is going to attack him like anyone on Fox would.
That being said, even if it's a one hour attack piece on Dr. Paul, it is STILL a good thing. Dr. Paul can defend himself and even if he doesn't turn 95% of the audience to supporters, I'm sure at least 5% will question why he is being attacked so much. That's 5% that we would not get if he hadn't gone on the show.