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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 McConnellRepublican wins La. Senate runoff in final 2016 race Heitkamp is Trump's top choice for Agriculture secretary: report Schumer calls for Senate probe into Russian interference MORE (R-Ky.). The organization is also backing Mississippi state Sen. Chris McDaniel against six-term incumbent Sen. Thad CochranThad CochranGOP senators voice misgivings about short-term spending bill Trump's wrong to pick Bannon or Sessions for anything Bottom Line 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 ReidReid: Comey should be investigated in wake of Russia report Spokesman: NY Times ignored Reid's comments in pre-election story on Russia Senate passes dozens of bills on way out of town MORE, not conservative cause," Dayspring tweeted on Friday.