From the May 4 edition of CNN's The Situation Room:
WOLF BLITZER (HOST): Yesterday with this National Enquirer story, I just want you to clarify. You don't really believe --
DONALD TRUMP: I didn't say
BLITZER: -- that Ted Cruz's father had anything to do with the assassination of President Kennedy?
TRUMP: No, I don't believe it.
BLITZER Because this was a story that was in the National Enquirer
TRUMP Of course I don't think that.
BLITZER Here is the question, you are the presumptive Republican presidential nominee --
TRUMP No, I wasn't. Not at the time.
BLITZER Last week you said you were, or you thought you were.
TRUMP: It was not announced until last night.
BLITZER: Don't you think you need a higher standard though than to get involved in this kind of stuff?
TRUMP: Wolf, here is what happened. Ted Cruz's father seems like a nice guy, I don't know him, but seems like a nice guy, he made horrible statements about me, you know, pray -- praying for bad things to happen to me. Okay, essentially. I said that's horrible. And I was on a show, one of your competitors, and they showed me the clip. I said, wow, that's horrible. It's not just a one-way street, you know, where I do something. It was a horrible statement. I was actually surprised by it. And during that and when I said how bad it was that a man would say something like that I said, well, why don't you read the various magazines because it's not only there, it was put in numerous where he has a picture of himself with Lee Harvey Oswald. I'm not saying they conspired.
BLITZER: It was on the internet. But the National Enquirer put it on its cover
TRUMP: I'm just saying, it was all over the place. I said well why don't you talk about that. That was it. I'm not saying he did it but I'm just saying it was all over the place.
BLITZER: Now that you're the Republican presumptive nominee you have to have a higher standard than to repeat conspiratorial theories like that.