Only the people making false claims.
He did say: "Not that I doubt that Iran helps Hamas but this Matthew Levitt person works for the Washington Institute of Near East Policies: So his assertions don't amount to much in the way of reliable evidence."
Any I guess to a leftist, perhaps that is not calling someone a liar, but to me it is.
He also makes excuses for hamas, and then claims he is not making excuses for hamas, which I think is a common leftist thing as well.
I'm not excusing hamas, but....