Charles Ernest Grassley is a prominent American politician serving as the senior United States senator from Iowa, a seat he has held since 1981. A member of the Republican Party, he is the most senior Republican in the Senate and has served as president pro tempore of the Senate. Before his Senate career, Grassley served in the Iowa House of Representatives and the United States House of Representatives. Throughout his long tenure, he has focused on issues such as government oversight, fiscal policy, and agriculture, earning a reputation for his diligent work ethic and constituent services.