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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 McConnellMitch McConnellMcCain hopes Americans can be confident GOP-controlled Congress can investigate president GOP Congress unnerved by Trump bumps Top Dem: GOP is terrified of Trump MORE (R-Ky.). The organization is also backing Mississippi state Sen. Chris McDaniel against six-term incumbent Sen. Thad CochranThad CochranMulvaney sworn in as White House budget chief Senate confirms Mulvaney to be Trump’s budget chief McCain announces opposition to Trump's pick for budget chief 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 ReidIf Gorsuch pick leads to 'crisis,' Dems should look in mirror first Senate confirms Mulvaney to be Trump’s budget chief Democrats declare victory after Puzder bows out MORE, not conservative cause," Dayspring tweeted on Friday.