Everyone had a field day with that, which led to Kerry issuing a statement of denial. Kerry denies ever having given such information to Iran, when he was Secretary of State and ever since.

Did Kerry leak the information or not? I don't know and I don't have anyway of knowing. I personally do not really trust any politician, almost ever - but especially when they are talking about top secret topics and their lies can almost definitely not be uncovered. As the old joke goes, how do you know when a politician is lying? When his lips are moving.

However, getting upset at Kerry over this means you trust the Iranian politician to be telling the truth. While I might not trust Kerry as far as I can throw him, I would trust the Iranian guy (especially on the topic of Israel) even less.