Central Intelligence Agency Director John Brennan takes questions after addressing the Council on Foreign Relations on March 11. The CIA has proposed deleting the email of almost all employees after they leave the agency. But some critics are saying a larger portion of the email should be preserved. Chip Somodevilla/Getty Images hide caption

itoggle caption Chip Somodevilla/Getty Images

A detainee is escorted in March 2002 by two Army military police at Guantanamo Bay, Cuba. The detainee was being led to the Joint Interrogation Facility to be interviewed by government investigators. Peter Muhly/AFP/Getty Images hide caption

itoggle caption Peter Muhly/AFP/Getty Images

President Obama signs H.J. Res 124, which includes appropriations to train and arm moderate Syrian rebels. For now, the effort will be paid for from an account meant to wind down the war in Afghanistan. Evan Vucci/AP hide caption

itoggle caption Evan Vucci/AP

Police fire tear gas from an armored personnel carrier on Aug. 18 in Ferguson, Mo. The U.S. Senate is holding a hearing on the use of military-grade equipment by local police departments. Jeff Roberson/AP hide caption

itoggle caption Jeff Roberson/AP