The GOP establishment-tied American Action Network is up with more than $500,000 worth of advertising thanking Republicans who voted to fund the Department of Homeland Security, an early move to ward off potential primary challengers.

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The ads defend the minority of House Republicans who sided with Speaker John BoehnerJohn Andrew BoehnerBlue wave poses governing risks for Dems Nancy Pelosi: Will she remain the ‘Face of the Franchise’? Jordan hits campaign trail amid bid for Speaker MORE (R-Ohio) and voted to fund the DHS through September without including riders targeting President Obama's executive actions on immigration.

The organization, which has ties to House Republican leadership, is running $350,000 in TV ads for Reps. Renee Ellmers (R-N.C.), Susan BrooksSusan Wiant BrooksWomen poised to take charge in Dem majority Hillicon Valley: Officials pressed on Russian interference at security forum | FCC accuses Sinclair of deception | Microsoft reveals Russia tried to hack three 2018 candidates | Trump backs Google in fight with EU | Comcast gives up on Fox bid Press shuts out lawmakers to win congressional softball game MORE (R-Ind.), Dan BenishekDaniel (Dan) Joseph BenishekRepublican groups launch final ad blitz in key House battlegrounds Tea Party class reassesses record Michigan Republican to retire MORE (R-Mich.) and Todd YoungTodd Christopher YoungOvernight Health Care: Senators target surprise medical bills | Group looks to allow Medicaid funds for substance abuse programs | FDA launches anti-vaping campaign for teens Bipartisan senators unveil proposal to crack down on surprise medical bills Dems seek ways to block Trump support for Saudi-led coalition in Yemen MORE (R-Ind.).

Ellmers has had the strongest rumor of a primary challenge, while Young and Brooks are both thought to be strong candidates for statewide office in Indiana at some point in the future who have establishment ties.

"Our security. Are you worried about it?" says the ad running in Ellmers's district. The spot goes on to praise Ellmers as a "conservative champion" who is "fighting for a stronger, safer America."

The group is also running digital ads for 16 other House Republicans: Reps. Vern Buchanan (Fla.), John Carter (Texas), Tom Cole (Okla.), Chris Collins (N.Y.), Jeff Denham (Calif.), Tom Emmer (Minn.), Kay GrangerNorvell (Kay) Kay GrangerThe stakes are sky-high for the pro-life cause in the upcoming midterms Bipartisanship alive and well, protecting critical infrastructure McCarthy's path to Speaker gets more complicated MORE (Texas), John Kline (Minn.), Michael McCaul (Texas), Candice Miller (Mich.), Kristi Noem (S.D.), Devin Nunes (Calif.), Robert Pittenger (N.C.), Joe Pitts (Pa.), John Shimkus (Ill.) and Glenn Thompson (Pa.).