A top aide for John Kasich slammed Republican National Committee (RNC) chairman Reince Priebus for saying that former candidates who don’t support Donald Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE could be penalized in some way.

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Priebus said Sunday that former candidates who have refused to back Trump despite signing a pledge during the primaries "need to get on board" and that the RNC will look into potential penalties for withholding support.

“The idea of a greater purpose beyond oneself may be alien to political party bosses like Reince Priebus, but it is at the center of everything Governor Kasich does. He will not be bullied by a Kenosha political operative that is unable to stand up for core principles or beliefs," John Weaver, a top aide for Kasich said in a statement.

“In fact, Reince should be thanking the Governor for standing for an inclusive, conservative vision that can actually win a national election and improve our country. The Governor is traveling the nation supporting down ballot Republicans and preventing a potential national wipeout from occurring on Reince’s watch."

Kaisch, along with former GOP candidates Ted Cruz Rafael (Ted) Edward CruzThe Hill's Morning Report - Sponsored by Facebook - Washington on edge amid SCOTUS vacancy Murkowski: Supreme Court nominee should not be taken up before election Battle lines drawn on precedent in Supreme Court fight MORE and Jeb Bush, have refused to support Trump.