Meanwhile, President Obama told NBC in an interview that, "I think we have a very good estimate of when they could potentially achieve breakout capacity, what stage they're at in terms of processing uranium. But do we know all the dynamics inside Iran? Absolutely not. And I think one of the difficulties is that Iran itself is a lot more divided now than it was. Knowing who is making decisions at any given time inside of Iran is tough. But we do have a pretty good bead on what's happening with their nuclear program."
Thomas E. Ricks covered the U.S. military for the Washington Post from 2000 through 2008.