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Sen. Marsha Blackburn, the top Republican on the Senate subcommittee that will hear from Haugen, said it has been \"fascinating\" to comb over documents that Haugen provided the committee.

\"What we want to know is how much data is Facebook capturing and what are they doing with that data, how long do they keep it, are they sharing with third parties, are they getting permission when they are datamining these children,\" Blackburn said on Fox Business on Monday.

It is not clear how much information Haugen has shared with the committee in advance of her testimony, but during her interview Sunday, Haugen said she took thousands of pages of documents from Facebook so that \"no one can question that this is real.\"

Haugen also alleged on CBS that Facebook decided to ease safeguards put in place to stop the spread of disinformation during the 2020 election season, which she says contributed to the Jan. 6 attack on the United States Capitol.

In an internal memo obtained by the New York Times, Clegg refuted that allegation as well.

\"Social media has had a big impact on society in recent years, and Facebook is often a place where much of this debate plays out,\" Clegg wrote. \"But what evidence there is simply does not support the idea that Facebook, or social media more generally, is the primary cause of polarization.\"

Haugen's appearance before the committee Tuesday comes as part of an ongoing effort by Congress to assess how to regulate massive social media companies such as Facebook.

Last week, in a hearing before the same subcommittee that Haugen will appear before, lawmakers accused Facebook of taking a page from \"big tobacco's playbook\" by hiding research about what they consider to be its addictive and harmful nature.

Antigone Davis, Facebook's global head of safety, faced bipartisan scrutiny as she defended the company during the hearing that lasted some three hours.

\"We understand that recent reporting has raised a lot of questions about our internal research, including research we do to better understand young people's experiences on Instagram,\" Davis stated in written testimony. \"We strongly disagree with how this reporting characterized our work, so we want to be clear about what that research shows, and what it does not show.\"

ABC News' Catherine Thorbecke contributed to this report

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