I do believe that the very tense relationship between the United States and Iran presents a challenge to the United States. But to discuss Iran as that type of a threat I find somewhat unconvincing, mindful of the fact that Iran actually doesn't have those military capabilities that would be needed to refer to it as that type of threat.
Trita ParsiIran has, by virtue of its growth and by virtue of the United States' mistakes in Iraq, tilted the balance of power in the Middle East. That is the case, but that doesn't necessarily mean it is a threat.
Trita ParsiThere seems to be a consistency, in that people who have had access to the Iranian program - people who actually have had boots on the ground and have been able to investigate and inspect the program - have consistently been saying these things.
Trita ParsiBeyond that is the fear that the United States will end up negotiating and agreeing to a deal with Iran. The Israelis do not like that either because they fear the deal will come at the expense of Israel's security interests. From an Israeli perspective, the NIE makes the risk of some sort of settlement much greater.
Trita Parsi