Escalating its anti-corruption message, a top Democratic super PAC on Friday launched a blistering web ad designed to portray House Republicans as irredeemably unethical ahead of the 2018 midterm elections.

The 30-second ad, sponsored by the House Majority PAC, which has close ties to Minority Leader Nancy Pelosi Nancy PelosiPelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' On The Money: Anxious Democrats push for vote on COVID-19 aid | Pelosi, Mnuchin ready to restart talks | Weekly jobless claims increase | Senate treads close to shutdown deadline Trump signs largely symbolic pre-existing conditions order amid lawsuit MORE (D-Calif.), highlights a series of scandals — some of them decades old — surrounding a handful of prominent Republicans hoping to replace retiring Speaker Paul Ryan Paul Davis RyanKenosha will be a good bellwether in 2020 At indoor rally, Pence says election runs through Wisconsin Juan Williams: Breaking down the debates MORE (R-Wis.). The spot is certain to be controversial since some of the allegations remain unproven or under investigation.

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At one point, the narrator invokes allegations that Rep. Jim Jordan James (Jim) Daniel JordanHouse panel pulls Powell into partisan battles over pandemic Sunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election House passes resolution condemning anti-Asian discrimination relating to coronavirus MORE (R-Ohio), who’s running for Speaker, failed to protect student athletes from a sexual predator when he was an Ohio State wrestling coach decades ago — a charge Jordan vehemently denies.

“Remind you of Joe Paterno?” the narrator says, referencing the legendary football coach who was accused of covering up a child sex abuse scandal at Penn State University.

The ad also targets Majority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy says there will be a peaceful transition if Biden wins GOP lawmakers distance themselves from Trump comments on transfer of power McCarthy claims protests in Louisville, other cities are 'planned, orchestrated events' MORE (R-Calif.) and Majority Whip Steve Scalise Stephen (Steve) Joseph ScaliseHouse GOP slated to unveil agenda ahead of election House panel details 'serious' concerns around Florida, Georgia, Texas, Wisconsin elections Scalise hit with ethics complaint over doctored Barkan video MORE (R-La.), two leading candidates to become the next Speaker.

The narrator knocks McCarthy for having “a lot of baggage,” as a 2015 headline — “Kevin McCarthy Quits Speaker Race Amid Allegations of Affair” — appears on the screen. McCarthy has denied any allegations of an affair.

Scalise, the narrator says, is “linked to KKK leader David Duke.” Scalise admitted to speaking to a white supremacist group in Louisiana in 2002, but has said he did not know the group’s ideology, apologized and made clear he rejects the organization’s beliefs.

House Majority PAC has spent “five figures” to run the ad online nationally, Democratic sources said.

“It’s clear Democrats are desperate to distract the American people from the fact they don’t have an agenda to address the real issues families are facing, and would rather spread dishonest attacks to try hiding their plans to abolish ICE and reverse the tax cuts that have been so successful at creating jobs," said Scalise spokeswoman Lauren Fine. "House Republicans will remain focused on creating jobs and rebuilding our economy so hardworking families have better opportunities to achieve the American Dream."

Spokespeople for McCarthy and Jordan did not respond to a request for comment.

The ad marks the latest, and most aggressive, effort by Democrats to portray the Republican Party as deeply corrupt and therefore unfit to lead Congress. The Democrats’ pared down midterm message features a vow to “clean up corruption,” and they’ve intensified that promise following last week’s arrest of Rep. Chris Collins Christopher (Chris) Carl CollinsConspicuous by their absence from the Republican Convention NY Republican Chris Jacobs wins special election to replace Chris Collins 5 things to watch in Tuesday's primaries MORE (R-N.Y.), who’s been accused of insider trading.

A similar anti-corruption campaign had helped to propel the Democrats into power in 2006, in the aftermath of the Jack Abramoff lobbying scandal. Eyeing another House takeover in November, Democrats are hoping the message resonates with voters already put off by President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE and the many charges of corruption swirling around his administration.

The ad tries to tie the GOP’s potential future leaders — McCarthy, Scalise and Jordan — to the party’s controversial past GOP leaders. It mentions the unpopular government shutdown under former Speaker Newt Gingrich (R-Ga.) during the 1990s, Speaker-in-waiting Bob Livingston’s dramatic resignation on the Houe floor after he confessed to an extramarital affair, and former Speaker Dennis Hastert John (Dennis) Dennis HastertFeehery: Trump landslide is only way to save the republic as we know it Feehery: A surprising Republican wave election could be looming Feehery: How Trump wins MORE’s sexual abuse scandal.

“Republican leaders not looking out for you,” the ad says.

—Tal Axelrod and Melanie Zanona contributed to this story, which was last updated at 5:53 p.m.