Sen. Lindsey Graham, a member of the Senate Armed Services Committee, said Sunday that Congress should form a new special committee, like it did during the Watergate and Iran-Contra scandals, to investigate what happened before, during and after the Sept. 11, 2012 terrorist attack on the U.S. consulate in Benghazi, Libya.

Graham also insisted that Gen David Petraeus, who resigned this week because he had been engaged in an extramarital affair, must testify in Congress about Benghazi.

Graham was responding to a question from host Bob Schieffer of CBS News’s Face the Nation who had asked the senator whether Congress should investigate Petraeus’s affair and how it was handled by the administration.