GOP mega-donor and Las Vegas casino magnate Sheldon Adelson is reportedly breaking with ex-White House adviser Stephen Bannon and switching his support to Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) over Bannon's push to challenge Republican incumbents in 2018.

“The Adelsons will not be supporting Steve Bannon’s efforts,” spokesman Andy Abboud told Politico in a report published Monday.

“They are supporting Mitch McConnell 100 percent. For anyone to infer anything otherwise is wrong,” he added, nearly a month after Adelson reportedly met with President Trump's former chief strategist in Washington, D.C.

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The report comes after Bannon has been courting possible donors to contribute to his efforts to unseat members whom he sees as part of the Republican establishment. Bannon aides told the news outlet that Adelson's decision is not a surprise, saying they did not count on his money because the business mogul has a history of supporting mainstream Republicans instead of outsiders. The report comes after Bannon reportedly spoke at the Zionist Organization of America's annual dinner on Sunday night — a group largely funded by Adelson. During the dinner, Bannon praised Adelson and called himself a “Christian Zionist,” the Jewish Telegraphic Agency reported.

Adelson and his wife, Miriam, did not attend the event, despite the dinner program saying Bannon would introduce the couple, according to the report.

One person close to the couple told Politico that Adelson partly did not show because he feared a joint appearance with Bannon could be misconstrued as an endorsement of his 2018 efforts.

Several people close to the billionaire had reportedly shared their concern of the perception that the two men are allied together.

Last month, Bannon said he is looking to challenge every sitting GOP senator except Sen. Ted Cruz (Texas), telling Fox News's Sean Hannity that "no one is safe."

The Bannon-Adelson split comes as one candidate strongly backed by the Breitbart News chief, Alabama Senate hopeful Roy Moore, faces mounting accusations of sexual misconduct against teenagers when he was in his 30s.