From the May 16 edition of Fox News' The O'Reilly Factor:
BILL O'REILLY (HOST): If you guys found that out, does it still hold today in 2016 that if you go after the Clintons on the personal stuff that will turn voters off? Do you still believe that?
KARL ROVE: Well let's define personal stuff. If by personal stuff you mean she boggled Benghazi --
O'REILLY: No no, that's all policy --
ROVE: That's all fair.
O'REILLY: Right.
ROVE: But if you want to go after Bill Clinton's infidelity, my advice would be first of all, this plane would dynamite. So don't, the first one who brings up this kind of stuff in my opinion is going to be the person who loses the issue. Now, maybe he needs to counter punch but he's got vulnerabilities of his own. Nothing on the scale of Clinton but he is on the record talking about his prowess with women and about his prowess with dating and so forth. So you got to be a little bit careful about this. She wants to be a victim and she has been successful in life when she has made herself a victim. She took Rick Lazio, let him come across the stage in their Senate race and throw, thrust a piece of paper under her nose, demand that she sign it and she turned herself into a victim and the last thing Donald Trump needs to do is turn her into a victim. Go after her, but go after her on the things that people consider to be reasonable, prudent and go to the heart of what he said. Thought he made a wise remark there. He said one of her weaknesses is she is not seen as sincere and authentic. Anyway he can go after that, great, but to just sort of gratuitously reach out there and bring Monica Lewinsky and Bill Clinton's indiscretions into this campaign in my mind, would be a mistake.