Army Pfc. Bradley Manning is escorted out of a courthouse in Fort Meade, Md., after a pretrial hearing in June. Manning is charged with aiding the enemy by giving hundreds of thousands of classified diplomatic cables and war logs to the secret-sharing website WikiLeaks.
David Petraeus, then-CIA director, testifies before the Senate Intelligence Committee in January. Petraeus resigned Friday after acknowledging an extramarital affair.
Karen Bleier/AFP/Getty Images
Members of Congress want to know why they didn't know more about the investigation involving former CIA Director David Petraeus, seen here testifying on Capitol Hill on Feb. 2.
Sen. Scott Brown, R-Mass., shakes hands with Democratic challenger Elizabeth Warren at their Oct. 1 debate in Lowell, Mass. The race is one of a handful of contests that could determine party control of the Senate.