In this photo provided by CBS News Sunday, May 12, 2013, Ambassador Thomas Pickering speaks on CBS's "Face the Nation" in Washington Sunday. Pickering and retired Adm. Mike Mullen, the

 

              In this photo provided by CBS News Sunday, May 12, 2013, Ambassador Thomas Pickering speaks on CBS
In this photo provided by CBS News Sunday, May 12, 2013, Ambassador Thomas Pickering speaks on CBS's "Face the Nation" in Washington Sunday. Pickering and retired Adm. Mike Mullen, the former chairman of the Joint Chiefs of Staff, led an investigation of the Benghazi attack that killed the U.S. ambassador and three others. His report about security at the Benghazi outpost was highly critical, but he stands by his assessment that decisions about the consulate were made well below the Secretary of State level. (AP Photo/CBS News, Chris Usher)