Sen. Mike Rounds, R-S.D., hit back at Donald Trump on Monday after the former president issued an insult-laden statement blasting the senator for not supporting his baseless claims of a stolen election.

The back and forth began when Rounds told ABC News in an interview Sunday that the 2020 presidential election was “as fair as we have seen.”

“As a part of our due diligence, we looked at over 60 different accusations made in multiple states. While there were some irregularities, there were none of the irregularities which would have risen to the point where they would have changed the vote outcome in a single state,” Rounds said on “This Week.”

Read the rest of the story at NBC News