Charles Ernest Grassley (born September 17, 1933) is an American politician serving as the president pro tempore of the United States Senate since 2025, a role he also held from 2019 to 2021. A member of the Republican Party, Grassley is the senior United States senator from Iowa, serving since 1981. He is the dean of the United States Senate. Before becoming a senator, Grassley served eight terms in the... see more