Legislative Contacts United States Senators Sen. Mike RoundsRepublicanUnited States SenateWashington, DC 20510http://www.rounds.senate.gov/ Senator John ThuneRepublicanUnited States SenateWashington, DC 20510(202) 224-2321http://www.thune.senate.gov/ United States Representative Rep. Dusty JohnsonRepublicanU.S. House of RepresentativesWashington, DC 20515https://dustyjohnson.house.gov/