Why did Saudi King Salman pull out of Camp David talks?

Aired: 5/11/2015 | 0:03:30 | Clip
Saudi Arabia's King Salman and the King of Bahrain won’t be attending President Obama’s summit of the Gulf Cooperation Council at Camp David, instead sending officials in their place.The State Department denied it's a snub, triggered by concerns about the U.S. pursuit of a nuclear deal with Iran. Chief foreign affairs correspondent Margaret Warner joins Gwen Ifill to discuss.