Iran and Nuclear Brinksmanship

Yesterday, time ran out for Iran to meet the UN Security Council's deadline to stop enriching uranium. President Ahmadinejad says that will never happen. The International Atomic Energy Agency reports that enrichment did, indeed, begin again in the past few days. President Bush says, "There must be consequences."But what will they be? So what does the United Nations do now? What’s the evidence that Iran is using enrichment technology to build a nuclear bomb? Is the case any better than the one against Saddam Hussein? What would economic sanctions look like, and what if diplomacy doesn’t work?(An expanded version of this discussion was originally broadcast earlier today on To the Point.)