It's a simple question with an infinitely complicated answer: what happens if Iran is able to build a nuclear weapon?
Russia is expected to deliver low-enriched uranium to Tehran to bring the Bushehr reactor, Iran's first nuclear power station, online. And the U.S., Israel and other nations are reportedly on alert, as hawks are calling for the bombing the reactor before the fuel is loaded into it.
In an exclusive report for our partner, the New York Times, David Sanger and Mark Mazzetti report that Iran's nuclear program may not be as far along as feared. Sanger joins us to talk about his investigation.