Republican National Committee Chairman Reince PriebusReinhold (Reince) Richard PriebusMeadows joins White House facing reelection challenges Trump names Mark Meadows as new chief of staff Mick Mulvaney's job security looks strong following impeachment MORE said the independent challenger to Sen. Pat RobertsCharles (Pat) Patrick RobertsGOP scrambles to fend off Kobach in Kansas primary Senate GOP opens door to smaller coronavirus deal as talks lag GOP group books ads for Kansas Senate primary MORE (R-Kan.) would not caucus with Senate Republicans if the GOP takes over the upper chamber's majority.

“It is an impossibility. It is not possible,” Priebus told Kansas City’s 41 Action News.

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He called the idea that independent Greg Orman might work with Republican leadership in the Senate “ridiculous.”

Orman has said he would like to caucus with the party that holds a clear majority, and Priebus's comments that he's a Democrat in disguise may be aimed at undercutting that argument.

“He's a Democrat. He's a major giver to Democrats,” he told the TV station. “And he's lying and not telling the truth to people in Kansas.”

Two new polls have shown Roberts with a lead in the tight race, but Republicans are worried Orman could cost them the seat — and their chance at taking over the Senate.

“The guy is a major donor, thousands of dollars to Barack Obama and Harry Reid," Priebus said.

Asked if there was a scenario in which he could see Orman choosing to caucus with the GOP — and if he would be welcomed if he did, Priebus replied, "No, I may have been born on a weekend, but it wasn't last weekend."