President Barack Obama said the US has a "very good estimate" of when Iran could complete work on a nuclear weapon, but he cautioned Monday that there are still many unanswered questions about Tehran's inner workings.
"Do we know all of the dynamics inside of Iran? Absolutely not," Obama said. "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." (AP)
