The accusations come almost every day from U.S. officials: Iran is seeking a nuclear weapon. Sponsoring terrorism. Killing Americans in Iraq. Intent on Israel's destruction. Yet, some officials add, its government will collapse if only given a push.

Does the U.S. have solid proof that Iran is guilty of such a long list of misdeeds? Or is the case against Iran -- and the certainty of its ill intent -- a bit fuzzy?

In the buildup to the Iraq war, the Bush administration made allegations against Saddam Hussein that polls show Americans believed, but which later proved wrong.