Republican Kansas Sens. Pat RobertsCharles (Pat) Patrick RobertsBob Dole, Pat Roberts endorse Kansas AG Derek Schmidt for governor Ex-Sen. Cory Gardner joins lobbying firm Senate GOP faces retirement brain drain MORE and Jerry MoranGerald (Jerry) MoranGraham: Bipartisan infrastructure pay-fors are insufficient This week: Democrats move forward with Jan. 6 probe Bipartisan senators ask CDC, TSA when they will update mask guidance for travelers MORE defended the Koch brothers Thursday after Senate Majority Leader Harry ReidHarry Mason ReidSenate hopefuls embrace nuking filibuster Biden fails to break GOP 'fever' Nevada governor signs law making state first presidential primary MORE’s (D-Nev.) called the pair “un-American” a day earlier.

“Yesterday two prominent citizens were called unpatriotic,” Roberts said Thursday. “Nothing David and Charles Koch have done is illegal.”

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On Wednesday, Reid accused David and Charles Koch of running anti-ObamaCare ads that lie.

“I guess if you make that much money, you can make these immoral decisions,” Reid said on the Senate floor. “The Koch brothers are about as un-American as anyone I can imagine.”

Moran compared Reid to Joseph McCarthy, who used his congressional power to label people as communists in the 1950s.

“It’s troubling that there is a reflexive reaction in Congress to label people who disagree with you as un-American,” Moran said. “This tactic didn’t end in 1950 and indeed it continues today.”

The Koch brothers, who have made their fortune off U.S. oil, are from Kansas.

Reid also accused the brothers of trying to buy America. The Kochs sponsor several Tea Party and Republican groups that run political ads.