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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 McConnellGun proposal picks up GOP support Children’s health-care bill faces new obstacles Dems see Trump as potential ally on gun reform MORE (R-Ky.). The organization is also backing Mississippi state Sen. Chris McDaniel against six-term incumbent Sen. Thad CochranWilliam (Thad) Thad CochranWhite House requests B for disaster relief GOP establishment doubts Bannon’s primary powers Whatever you think the Alabama special election means, you’re probably wrong 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 ReidChris Murphy’s profile rises with gun tragedies Republicans are headed for a disappointing end to their year in power Obama's HHS secretary could testify in Menendez trial MORE, not conservative cause," Dayspring tweeted on Friday.