Yesterday, Dianne Feinstein threatened to subpoena the CIA over a trip report from David Petraeus that he allegedly wrote after a personal trip to Benghazi after the terrorist attack that killed four Americans. Today, ABC News reports that Petraeus' visit to Libya was no mere observational tour. The then-Director of Central Intelligence conducted his own interviews with personnel on the ground in Libya in preparation for testimony that has now been cancelled: In late October, Petraeus traveled to Libya to conduct his own review of the Benghazi attack that killed four Americans, including U.S. Ambassador Christopher Stevens.While in Tripoli, he...