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The SCF is likely to spend the cash on ads attacking incumbent Republicans facing primary challenges from Tea Party-aligned candidates. 

On Friday, the group endorsed Matt Bevins, a Louisville businessman who is mounting a primary campaign against Senate Minority Leader Mitch McConnellAddison (Mitch) Mitchell McConnellPolitical figures pay tribute to Charles Krauthammer Charles Krauthammer dies at the age of 68 Overnight Energy: EPA declines to write new rule for toxic spills | Senate blocks move to stop Obama water rule | EPA bought 'tactical' pants and polos MORE (R-Ky.). The organization is also backing Mississippi state Sen. Chris McDaniel against six-term incumbent Sen. Thad CochranWilliam (Thad) Thad CochranTodd Young in talks about chairing Senate GOP campaign arm US farming cannot afford to continue to fall behind Mississippi Democrat drops Senate bid MORE (R-Miss.).

The spending has drawn the ire of some Republicans, including National Republican Senatorial Committee communications director Brad Dayspring.

 "Conservatives who give to SCF do so for right reasons. Sadly biggest beneficiary of SCF tactics has been Harry ReidHarry Mason ReidAmendments fuel resentments within Senate GOP Donald Trump is delivering on his promises and voters are noticing Danny Tarkanian wins Nevada GOP congressional primary MORE, not conservative cause," Dayspring tweeted on Friday.