Is Obama’s Iran deal rhetoric working?

Aired: 8/5/2015 | 0:12:28 | Clip
President Obama, in an address denouncing critics of the Iran nuclear agreement, warned that America’s international credibility would be lost if Congress kills the deal. How successful was the president in making his case? Gwen Ifill gets views from Ray Takeyh of the Council on Foreign Relations and Nicholas Burns of Harvard University.