CHRIS JANSING, NBC NEWS: How important is that final number? It's breathtakingly close for a lack of a better adjective. If it's razor thin, what kind of message does that send? And how much do the numbers matter to the president and the White House.
JOSH EARNEST, THE WHITE HOUSE: Not at all. And let me tell you why. The fact is we don't need Congress to approve this deal. We just need Congress not to screw it up. So, Congress has an opportunity to play spoiler right now and if they fail in that effort this deal will move forward. It will be implemented. And we will have taken the most important step we can -- the best step we can -- to prevent Iran from obtaining a nuclear weapon.