From Time Magazine, behind paywall, quoted in Huffington Post:
Well, of course, the religious leaders of Iran have sworn on their word of honor that they're not going to manufacture nuclear weapons. If they are lying, then I don't see that as a major catastrophe because they'll only have one or two military weapons. Israel probably has 300 or so.
Only slightly less outrageous: Noam Sheizaf at +972mag -one of the intended victims of any Iranian bomb - shows this same quote from Carter. His takeaway fact is that - warmongering Israel has 300 nuclear weapons, seemingly confirmed as "probably" by an ex-president who hasn't seen any intelligence reports for over three decades.
(h/t Ian)