William McClellan “Mac” Thornberry (born July 15, 1958) is an American politician serving as a U.S. Representative from the Texas Panhandle. He has served since 1995, when the House seated its first Republican majority in 40 years, and signed the “Contract with America” authored by then Speaker Newt Gingrich. A Republican, Thornberry represents Texas’s 13th congressional district, the most Republican district in the United States by partisan voting index. The district stretches between the Oklahoma and New Mexico borders.
In September 2019, Thornberry announced that he will not run for reelection in 2020.