Ron Johnson is the senior United States Senator from Wisconsin, having served in the Senate since 2011. A member of the Republican Party, he was born in Mankato, Minnesota, in 1955 and graduated from the University of Minnesota. Before his election to the Senate, he built a successful plastics manufacturing business in Oshkosh, Wisconsin. He was elected in 2010 as part of the Tea Party wave and narrowly won re-election in 2016 and 2022, each time in competitive races that reflected Wisconsin's status as a battleground state.
Johnson serves on the Senate Homeland Security and Governmental Affairs Committee and the Senate Foreign Relations Committee. Throughout his tenure, he has focused on fiscal conservatism, government oversight, and regulatory reform. He gained significant national attention for his skepticism about COVID-19 vaccines and public health mandates, and for his role in spreading and amplifying claims about the 2020 presidential election and the January 6, 2021 Capitol attack. His willingness to challenge consensus views on both public health and election integrity has made him one of the most controversial figures in the Senate.