Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: Trump's ban on TikTok, WeChat in spotlight | NASA targeted by foreign hackers | Instagram accused of spying in lawsuit The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks Hillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll MORE is drawing intense scrutiny from lawmakers demanding that the Facebook founder testify to Congress about the Cambridge Analytica controversy.

Facebook’s data practices are under the microscope like never before following a report that the British research firm connected to President Trump Donald John TrumpBiden leads Trump by 36 points nationally among Latinos: poll Trump dismisses climate change role in fires, says Newsom needs to manage forest better Jimmy Kimmel hits Trump for rallies while hosting Emmy Awards MORE’s campaign improperly obtained information on 50 million Facebook users as it sought to find ways of influencing voters at the polls.

On Monday, the top Republicans on the Senate Commerce Committee — Sens. John Thune John Randolph ThuneWhat Senate Republicans have said about election-year Supreme Court vacancies The Hill's 12:30 Report - Presented by Facebook - Don't expect a government check anytime soon The Hill's Morning Report - Sponsored by The Air Line Pilots Association - Trump contradicts CDC director on vaccine, masks MORE (S.D.), Roger Wicker Roger Frederick WickerHillicon Valley: DOJ indicts Chinese, Malaysian hackers accused of targeting over 100 organizations | GOP senators raise concerns over Oracle-TikTok deal | QAnon awareness jumps in new poll Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' Republican Senators raise concerns over Oracle-TikTok deal MORE (Miss.) and Jerry Moran Gerald (Jerry) MoranLobbying world This World Suicide Prevention Day, let's recommit to protecting the lives of our veterans Hillicon Valley: Zuckerberg acknowledges failure to take down Kenosha military group despite warnings | Election officials push back against concerns over mail-in voting, drop boxes MORE (Kan.) — sent a list of questions to Zuckerberg about the “troubling” reports, with Moran saying Zuckerberg needed to testify.

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“That’s our first step, and then I think testimony in front of the Commerce Committee would be appropriate and required,” Moran told reporters on Tuesday. “I think there’s a lot of questions left to be answered.”

The top Democrat on the House Intelligence Committee, Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (Calif.), also told The Hill on Tuesday that he believes that Zuckerberg, along with other CEOs, should attend hearings.

“We had the general counsel come in. That was quite some time ago. We’ve learned more about the Russian interference since then,” Schiff explained.

Zuckerberg is also taking heat in Europe.

British lawmakers, who are concerned about the episode with London-based Cambridge Analytica, have called on him to appear before Parliament’s digital oversight committee.

As the calls for answers mount, Zuckerberg has remained silent. His company has sought to send the signal that it takes the matter seriously even as it faults Cambridge Analytica and other players.

“Mark, Sheryl and their teams are working around the clock to get all the facts and take the appropriate action moving forward, because they understand the seriousness of this issue,” Facebook said in a statement, referring to the company’s Chief Operating Officer Sheryl Sandberg.

“The entire company is outraged we were deceived. We are committed to vigorously enforcing our policies to protect people’s information and will take whatever steps are required to see that this happens.”

The company has also promised to investigate the incident and Cambridge Analytica’s handling of the data. For its part, Cambridge Analytica has denied any wrongdoing and says that the data was not used during its work for the Trump campaign.

The appearance before any congressional panel of the billionaire tech magnate would be a cable television blockbuster — particularly given Cambridge Analytica’s work for President Trump’s campaign and the cloud of the Russia investigation hanging over the political world.

Zuckerberg and other tech CEOs take great pains to stay out of the spotlight in the midst of controversies, and that impulse is likely heightened now that the industry is faced with a growing movement that wants to hit them with tougher regulations.

Facebook in October revealed that Russian groups used its platform to influence the U.S. political process. That led to hearings in November at which lawmakers grilled Facebook and other tech companies about how the influence campaign was able to use their platforms to sow discord among voters.

Facebook dispatched its top lawyer to testify in November. This time around, Congress is strongly hinting that sending lawyers won’t be enough.

“The last time we had a hearing, Facebook and Google and Twitter sent their lawyers, which were undoubtedly expensive because they did a damn fine job of dodging and bobbing and weaving,” Sen. John Kennedy John Neely KennedyMORE (R-La.) told reporters on Monday. “They didn’t say a damn thing.”

Sen. Amy Klobuchar Amy KlobucharBattle lines drawn on precedent in Supreme Court fight Sunday shows - Ruth Bader Ginsburg's death dominates Klobuchar: GOP can't use 'raw political power right in middle of an election' MORE (D-Minn.) and Kennedy this week urged Senate Judiciary Committee Chairman Chuck Grassley Charles (Chuck) Ernest GrassleyGOP set to release controversial Biden report McConnell locks down key GOP votes in Supreme Court fight Senate Republicans face tough decision on replacing Ginsburg MORE (R-Iowa) to hold a hearing with Zuckerberg and other tech CEOs about how their platforms oversee political firms’ data practices.

“This is a major breach that must be investigated,” Klobuchar said over the weekend. “It’s clear these platforms can’t police themselves.”

While members have ripped executives at Facebook and other companies, the major social media platforms are no closer to facing regulation today then they were immediately after the November hearings. One of Facebook’s biggest worries now is that public testimony from Zuckerberg about his company’s data and advertising practices could be one of the first steps toward changing that.

Klobuchar said that Facebook’s controversy with Cambridge Analytica is further evidence that internet companies need to be regulated. She and the Senate Intelligence Committee’s top Democrat, 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 (Va.), have pushed their Honest Ads Act legislation, which aims to hold tech companies to the same political ad transparency standards as radio, TV and print outlets, as a way to do this.

For all of the growing bipartisan outrage at companies like Facebook and Google, Republicans have generally been loath to regulate the platforms. But there’s no guarantee that Facebook’s good luck will continue in the wake of this latest scandal, especially as Democrats, who have a good chance of reclaiming Congress this year, become more willing to confront Silicon Valley and its left-leaning leaders.

“Mark Zuckerberg ought to be subpoenaed if he doesn’t appear voluntarily. [He should] appear under oath, in public, along with other CEOs in the same space, and Alexander Nix of Cambridge Analytica and others connected with the company,” Sen. Richard Blumenthal (D-Conn.) said.