(FILE) In Profile: 100 Years Of US Secretaries Of State

(FILE PHOTO) In this composite image a comparison has been made between former US President Bill Clinton and his serving Secretary of State Warren Christopher. ***LEFT IMAGE*** WASHINGTON - 1995: (NO NEWSWEEK - NO USNEWS) President Bill Clinton speaks at a press conference October 31, 1995 in Washington, DC. Clinton informed the press that Secretary of State Warren Christopher and a negotiating team were preparing to leave for Dayton, Ohio to begin direct negotiations for peace in the Balkans with the presidents of Bosnia, Croatia and Serbia. (Photo by Diana Walker/Liaison) ***RIGHT IMAGE*** WASHINGTON - 1996: Secretary of State Warren Christopher speaks during a press conference April 11, 1996 in Washington, DC. Vice President Al Gore named Christopher the head his vice presidential search team on April 6, 2000. Christopher headed up the selection process for candidate Bill Clinton in 1992. (Photo by Diana Walker/Getty Images)