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 BoehnerBoehner says it's Democrats' turn for a Tea Party movement House Republicans find silver lining in minority Alaskan becomes longest serving Republican in House history 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 BrooksHouse Republicans find silver lining in minority The Hill's 12:30 Report: Sanders set to shake up 2020 race House Dems release 2020 GOP 'retirements to watch' for 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 Defense: Senate breaks with Trump on Yemen war | Shanahan hit with ethics complaint over Boeing ties | Pentagon rolls out order to implement transgender ban | Dem chair throws cold water on Space Force budget Senate breaks with Trump on Saudi-led war in Yemen GOP senators introduce bill to rein in president's emergency powers 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 GrangerOn The Money: Trump issues first veto, warning of 'reckless' resolution | US hits Russia with new sanctions | Dems renew push for contractor back pay | Lawmakers seek probe into undocumented workers at Trump businesses House Dems renew push for government contractor back pay The Hill's Morning Report — Cohen testimony turns up heat on Trump associates 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.).