Rep. Jason Chaffetz; Margaret Brennan; Vali Nasr

Rep. Jason Chaffetz discusses the investigation into the 9/11 Benghazi attack in 2012 and the potential cover up. CBS News reporter Margaret Brennan shares her perspective on the State Department's handling of the Benghazi investigation. Vali Nasr of Johns Hopkins University explains why his experience as part of the Obama administration was "deeply disillusioning," and discusses his book, "The Dispensable Nation: American Foreign Policy in Retreat."