John Randolph Thune is an American politician serving as the senior United States senator from South Dakota, a seat he has held since 2005. A member of the Republican Party, he has been the Senate majority leader and Senate Republican leader since 2025. Thune is in his fourth Senate term and is the dean of South Dakota's congressional delegation since 2015.
A South Dakota native, Thune is a graduate of Biola University and the University of South Dakota. From Wikipedia
