Mitchell, who helped broker the Good Friday Agreement in Northern Ireland, weighs in on the conflict in the Middle East, where he also served as an envoy.

Former Sen. George Mitchell: U.S. Actions 'Undermine' Half-Century Of Policy In Middle East

Former Secretary of State Hillary Clinton is seated with (left to right) Israeli Prime Minister Benjamin Netanyahu, Palestinian President Mahmoud Abbas and former Special Envoy for Middle East Peace George Mitchell as she hosts the relaunch of direct negotiations at the State Department in Washington, Thursday, Sept. 2, 2010. (Charles Dharapak/AP)