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

Yahoo CEO Marissa Mayer delivers the keynote address at the annual Consumer Electronics Show in Las Vegas earlier this month. Robert Galbraith/Reuters/Landov hide caption

itoggle caption Robert Galbraith/Reuters/Landov