In January 1991, Grassley was one of only two Republican senators to vote against joining the international coalition to force Iraq out of Kuwait, the other being Mark Hatfield of Oregon. In August 1991, he became one of six Republicans on the Select Senate Committee on POW-MIA Affairs that would investigate the number of Americans still missing in the aftermath of the Vietnam War following renewed interest. In July 1998, President Bill Clinton listed Grassley among the members of Congress who had made it possible "for me to sign into law today the Internal Revenue Service Restructuring and Reform Act." On February 12, 1999, Grassley was one of 50 Senators to vote to convict and remove Bill Clinton from office.