Facebook is in talks with lawmakers about having its chief executive, Mark Zuckerberg, testify to Congress about the social network’s handling of user data.

The company is in contact with all three congressional committees that have requested testimony from Zuckerberg: the Senate Judiciary Committee, the Senate Commerce, Science and Transportation Committee and the House Energy and Commerce Committee, a Facebook spokesperson said.

The company would not confirm a CNN report Tuesday that Zuckerberg had made up his mind and agreed to testify about how personal information from 50 million unsuspecting Facebook users ended up in the hands of Cambridge Analytica, a political consulting firm that worked on Donald Trump’s presidential campaign.

Zuckerberg will not appear before a British parliamentary committee on misinformation and social media, choosing instead to send one of his deputies, the company said Tuesday.

An appearance by Zuckerberg before Congress would signal that the company is bowing to pressure at home in the most serious crisis in its 14-year history.

The Federal Trade Commission confirmed Monday that it was investigating the social media giant to determine whether it had violated a consent order to disclose uses of customers’ data. On the same day, 37 state attorneys general sent a letter to Facebook asking about the company’s data policies and its role in the Cambridge Analytica controversy.

Facebook is also facing a backlash from consumers, highlighted by the #deletefacebook hashtag. The company is now trying to win back trust from its more than 2 billion users worldwide.

The scrutiny could amount to a national reckoning about the future of social media and its advertising-based business model that requires collecting ever more intrusive personal data to thrive.

If Zuckerberg does decide to testify, it will probably raise pressure on his counterparts — Google CEO Sundar Pichai and Twitter CEO Jack Dorsey — to also agree to requests to appear before Congress.

Twitter declined to comment. Google did not respond to a request for comment.

The three companies sent mostly attorneys to speak to Congress about Russian interference last year. If those hearings are a preview of what’s in store, the executives can expect tough questioning should they choose to appear.

Zuckerberg drew a strong rebuke Tuesday from Damian Collins, chair of the U.K. parliamentary inquiry into fake news, for refusing to testify.

“It is absolutely astonishing that Mark Zuckerberg is not prepared to submit himself to questioning in front of a parliamentary hearing, given these are questions of fundamental importance and concern to his users, as well as to this inquiry,” said Collins, according to the Guardian.

Facebook said it would send either Chief Technology Officer Mike Schroepfer or Chief Product Officer Chris Cox to explain to Parliament how Cambridge Analytica obtained unauthorized information.

The data was derived from a quiz app developed by a University of Cambridge professor in 2013 that collected information from users who downloaded the game, and their friends. The professor violated Facebook rules by then selling that data to Cambridge Analytica, which used it to try to sway voters.

Facebook did not tell the 50 million users that their data had been compromised, nor did it verify that Cambridge Analytica destroyed that data as promised. Facebook amended its rules in 2015 to reduce the amount of information it shared with app developers.