U.S. President George W. Bush signs a letter to Congress regarding the Colombian Free Trade Agreement in the Old Executive Office building of White House in Washington, April 7, 2008. Behind Bush are (L-R) Defense Secretary Robert Gates, Secretary of State Condoleezza Rice, U.S. Trade Representative Susan Schwab, Labor Secretary Elaine Chao, Director of the Office of National Drug Control Policy John Walters and Agriculture Secretary Ed Schafer. REUTERS/Jason Reed (UNITED STATES)