Sen. Mike Rounds, R-S.D., issued a harsh threat against Russians aiming to tamper with the 2018 midterm elections.

“We have to have the ability to keep track of and to prove to people that these are honest elections and that an outside power didn’t do it,” Rounds said in an interview with John Catsimatidis in New York. “Part of the way we do that is to let the Russians know that if they mess with that stuff there will be hell to pay.”