Two Republican outside groups are launching their final ad blitz in more than a dozen House battlegrounds as Republicans seek to protect one of their largest majorities in decades.

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Congressional Leadership Fund, a super-PAC tasked with protecting House Republicans’ majority, and American Action Network, a nonprofit aligned with House GOP leadership, launched 14 ads in 13 competitive districts.

The ads, which will remain on the air through Election Day, target Democratic incumbents and candidates as rubber stamps on Democratic presidential nominee Hillary ClintonHillary Diane Rodham ClintonWith VP pick, Biden can't play small ball in a long ball world Hillary Clinton on US leading in coronavirus cases: Trump 'did promise "America First"' Democratic fears rise again as coronavirus pushes Biden to sidelines MORE, members of Democratic House leadership and policies of the party including ObamaCare and the Iran deal. 

Seven of the ads attack Democrats over their support for ObamaCare amid the news of rising premium costs. These ads will run in the districts of Reps. Jeff Denham (R-Calif.), Tim Walberg (R-Mich.), Rick Nolan (D-Minn.), Brad Ashford (D-Neb.), and Elise Stefanik (R-N.Y.). The ads are also running in the open seats of Reps. 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 Robert HurtRobert HurtThe Hill's Morning Report — Presented by the Coalition for Affordable Prescription Drugs — GOP faces ‘green wave’ in final stretch to the midterms Democrat defeats controversial chair of House Wall Street subpanel Republican groups launch final ad blitz in key House battlegrounds MORE (R-Va.).

Other ads target Democrats for their support of various taxes. The ad “Cost Us,” criticizes Democrat Jim Mowrer over his support for the estate tax. He faces Rep. David Young (R-Iowa.). Another ad titled “Winter is Coming,” knocks Democrat Emily Cain for saying she would support a carbon tax. She faces a rematch against Rep. Bruce Poliquin (R-Maine).

The remainder of the spots will run in the districts of Rep. Rod Blum (R-Iowa) and the open seats of Reps. Patrick Murphy (D-Fla.), Chris Gibson (R-N.Y.) and Reid RibbleReid James RibbleFormer Sen. Tom Coburn dies at 72 Ex-GOP lawmakers side with NY in Supreme Court case over Trump tax returns Former GOP lawmakers, officials ask court to enforce House subpoena on McGahn MORE (R-Wis.).

To date, both groups have spent more than $45 million in 32 districts across the country.

Republicans are largely on defense this cycle to protect their history majority. Democrats have an uphill battle to regain control of the lower chamber, needing to net 30 seats.