Robert Jones Portman (born December 19, 1955) is an American attorney and politician who served as a United States senator from Ohio from 2011 to 2023. A member of the Republican Party, Portman was the 35th director of the Office of Management and Budget (OMB) from 2006 to 2007, the 14th United States trade representative from 2005 to 2006, and a U.S. representative from 1993 to 2005, representing Ohio's 2nd district.