Appearing alongside CIA Director David Petraeus before the Senate Select Committee on Intelligence last week, James Clapper, the director of national intelligence, said of Iran:

"We don't believe they've actually made the decision to go ahead with a nuclear weapon."

Before the hearing, as James Fallows of The Atlantic reports, Clapper released his "Worldwide Threat Assessment." It read, "We do not know ... if Iran will eventually decide to build nuclear weapons."

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