Former U.S. Senator Chuck Hagel (L) walks down the hallway of the Russell Senate Office Building with CIA Spokesperson Marie Harf (R) and Assistant Secretary of Defense for Legislative Affairs Elizabeth King before meeting with Sen. John McCain (R-AZ) on Capitol Hill January 22, 2013 in Washington, DC. Hagel, who cochaired McCain's 2000 presidential campaign, has been nominated by U.S. President Barack Obama to succeed Leon Panetta as Secretary of Defense.