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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 McConnellSenate healthcare bill appears headed for failure Talk of Trump pardons reverberates on Sunday shows Trump backers eye GOP primary challenges for Flake, Heller MORE (R-Ky.). The organization is also backing Mississippi state Sen. Chris McDaniel against six-term incumbent Sen. Thad CochranThad CochranOvernight Finance: GOP offers measure to repeal arbitration rule | Feds fine Exxon M for Russian sanctions violations | Senate panel sticks with 2017 funding levels for budget | Trump tax nominee advances | Trump unveils first reg agenda Senate committee ignores Trump, House budgets in favor of 2017 funding levels Overnight Finance: CBO finds 22M more uninsured under Senate health bill | GOP agrees ObamaCare taxes must go | Supreme Court to look at Dodd-Frank whistleblower protections | More tax reform hearings | Green light for partial travel ban | 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 ReidConservative Senate candidate calls on GOP to end filibuster Ex-Reid aide: McConnell's 'original sin' was casting ObamaCare as 'partisan, socialist takeover' GOP faces growing demographic nightmare in West MORE, not conservative cause," Dayspring tweeted on Friday.