Peter Lance, author of Triple Cross: How bin Laden's Master Spy Penetrated the CIA, the Green Berets, and the FBI—and Why Patrick Fitzgerald Failed to Stop Him, discusses Ali Mohamad's infiltration of the U.S. government, the Egyptian core of al Qaeda, how the FBI could have prevented the 1993 WTC bombing, informant Emad Salem's heroic attempt to infiltrate the Blind Sheik's cell and later get him convicted of the bombing, FBI manager Carson Dunbar's unbelievable arrogance and incompetence,...