John Kennedy actually said...

"No, I think it would be a mistake to attempt to make that assessment on this occasion."

"Well, I don't want to say anything that will prejudice Secretary Harriman's trip."

"Well, I don't know--I am familiar with the general thesis of Professor Rock."

"Well, I would think a discussion of that kind of a question, if the question is as you put it, is really not very useful to the exiles, or to the cause of Cuba."