Top executives from Facebook and Twitter are expected to face a grilling from Capitol Hill lawmakers in two separate hearings on Wednesday covering alleged anti-conservative bias and foreign governments manipulating social media platforms to influence U.S. politics.

Twitter CEO Jack Dorsey and Facebook Chief Operating Officer Sheryl Sandberg are set to face the biggest political tests of their careers as they face lawmakers for the first time in a public congressional hearing.

Republicans on the House Energy and Commerce Committee are likely to come at Dorsey with knives out over claims that conservatives are being suppressed on Twitter.

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At the Senate Intelligence Committee hearing, lawmakers on both sides of the aisle will demand answers on how Facebook and Twitter are making their platforms safer from foreign interference as the November midterm elections approach.

The stakes will be particularly high for Dorsey, who will testify alone at the House Energy and Commerce hearing on alleged anti-conservative bias following morning testimony alongside Sandberg on the Senate side of the Capitol. Without any tech allies by his side, Dorsey runs the risk of becoming a punching bag for House GOP lawmakers with a long list of grievances against Silicon Valley in general.

House Republicans plan on asking about Twitter’s past snafus, which they believe indicate a clear pattern of anti-conservative bias, such as not displaying some conservatives in the platform’s drop-down search results and Twitter downranking a hashtag disparaging Democratic nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE during the 2016 presidential campaign.

GOP members of the House panel, led by Chairman Greg Walden Gregory (Greg) Paul WaldenTrump order on drug prices faces long road to finish line Ignore the misinformation: The FDA will ensure the safety of any COVID-19 vaccine Hillicon Valley: Trump backs potential Microsoft, TikTok deal, sets September deadline | House Republicans request classified TikTok briefing | Facebook labels manipulated Pelosi video MORE (R-Ore.), also want to highlight high-profile anecdotes that suggest Twitter temporarily silences more Republicans than Democrats, rather than focusing on any data that might support accusations of systematic bias against conservatives.

“The bottom line is there are more censorship errors with high-profile Republicans to point to than with anyone on the left,” a congressional staffer told The Hill. “Twitter has chalked that up to mistakes. Whether bias is intentional or not, even a well-intentioned algorithm can have consequences.”

The staffer added that one of Walden’s chief goals for the hearing is to get Dorsey to pull back the hood on Twitter’s algorithms and get more transparency from the company.

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Klon Kitchen, a cyber policy analyst with the right-leaning Heritage Foundation, said satisfying the committee’s desire for transparency is Dorsey’s best route to a less-divisive hearing.

“They’re going to be well-served if they don’t just deny bias but show actions they take to mitigate bias,” he said. “If they can show with real numbers and metrics that so-called conservative bias isn’t existent, that will go a long way.”

Kitchen said it’s imperative that Dorsey address anything he believes is a misconception in a humble, respectful manner.

“He can’t be evasive or condescending,” Kitchen said.

Dorsey appears ready to strike a conciliatory tone, according to his prepared remarks for Wednesday afternoon.

“Despite the success we are seeing with our use of algorithms to combat abuse, manipulation, and bad faith actors, we recognize that even a model created without deliberate bias may nevertheless result in biased outcomes,” Dorsey’s statement reads. “Bias can happen inadvertently due to many factors, such as the quality of the data used to train our models.”

The pressure he faces on Wednesday is compounded by frustrations expressed by Republicans in recent weeks.

President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE and House Majority Leader Kevin McCarthy Kevin Owen McCarthyMcCarthy's Democratic challenger to launch first TV ad highlighting Air Force service as single mother Trump asked Chamber of Commerce to reconsider Democratic endorsements: report The Hill's Morning Report - Sponsored by The Air Line Pilots Association - White House moves closer to Pelosi on virus relief bill MORE (R-Calif.), who pushed for the Dorsey hearing, have both ripped into tech titans recently, accusing them of bias against conservatives.

“I think Google and Facebook and Twitter, I think they treat conservatives and Republicans very unfairly,” Trump told reporters last week.

Dorsey will also have to square off with Rep. Marsha Blackburn Marsha BlackburnTaylor Swift on National Voter Registration Day: 'We need everyone' Democrats smell blood with new DHS whistleblower complaint Hillicon Valley: Election officials prepare for new Russian interference battle | 'Markeyverse' of online fans helps take down a Kennedy | GOP senators unveil bill to update tech liability protections MORE (R-Tenn.), a Senate candidate who will be eager to challenge the company’s CEO in a public setting.

Blackburn has been a vocal critic of Twitter ever since the company temporarily suspended one of her campaign videos from being promoted as an ad because it mentioned abortion.

Dorsey may get some support from Democrats, though. At the House Judiciary Committee’s past two hearings on anti-conservative bias, Democrats questioned the premise of the hearing and tried to shift the conversation toward Russia’s election meddling efforts.

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Democrats on the House Energy and Commerce Committee could implement a similar tactic on Wednesday.

During the Senate Intelligence hearing, lawmakers aren’t expected to come at Dorsey and Sandberg with the same ire, but they’re unlikely to let the companies off easy.

Committee Chairman Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) and Vice Chairman Mark Warner Mark Robert WarnerIntelligence chief says Congress will get some in-person election security briefings Overnight Defense: Trump hosts Israel, UAE, Bahrain for historic signing l Air Force reveals it secretly built and flew new fighter jet l Coronavirus creates delay in Pentagon research for alternative to 'forever chemicals' House approves bill to secure internet-connected federal devices against cyber threats MORE (D-Va.) have welcomed recent actions from Twitter and Facebook to boot foreign misinformation campaigns from their platforms, but Burr said in a recent statement that “there is still much that needs to be done to prevent and counter foreign interference on social media.”

Sandberg plans to make known Facebook’s efforts on that front.

“This is an arms race, and that means we need to be ever more vigilant,” she will say in her prepared remarks, provided to The Hill. “As Chairman Burr has noted, ‘Nothing less than the integrity of our democratic institutions, processes and ideals is at stake.’ We agree, and we are determined to meet this challenge.”

Even though Google won’t have a representative at Wednesday’s hearing, the company nevertheless will likely be lambasted by Senate Intelligence members irritated that one of its top executives won’t be present.

The company offered up its vice president of global affairs, Kent Walker, but the committee wanted Alphabet CEO Larry Page to testify.

Walker still submitted testimony to the committee about actions Google is taking on foreign actors trying to manipulate its platform.