When Zahn pushed the former President on whether he thought the ads were "OK," he said: "I don't know whether they're OK or not. I think they are-the one that I'm interested in is if they go forward with what-what John Kerry said when he came back from Vietnam. Because I remember that. And I think that's fair game. I don't know about these. If it's proved they're untrue, then it's not right. But if there's truth in it, then it's OK."