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On Saturday, The New York Times and The Observer of London reported that the data firm, Cambridge Analytica, mined data from millions of Facebook users -- largely without permission -- through an app created by a Russian-American psychologist, with the goal of using the data to create voter profiles and craft political messages.

Facebook did not publicly acknowledge the possible data breach until the report surfaced over the weekend, and did not notify users that their information had been obtained by a third party.

Cambridge Analytica has denied improperly obtaining any data, said they destroyed the unauthorized data as soon as they learned of it and said none of the information was used in its work 2016 presidential campaign work.

On Monday, Facebook announced that it had hired a digital forensics firm, Stroz Friedberg, to audit Cambridge Analytica and sweep the firm’s servers and systems to confirm that the tranche of Facebook data had been destroyed after acknowledging reports that the data may still exist.

“We are moving aggressively to determine the accuracy of these claims. We remain committed to vigorously enforcing our policies to protect people’s information,” the company said in a statement.

Facebook has turned over records to investigators with special counsel Robert Mueller’s team and the company has said it is cooperating.

\"Democratic
AP
Democratic member of the Senate Judiciary Committee Sen. Amy Klobuchar, D-Minn., questions the Republican side on Monday, April 3, 2017, on Capitol Hill in Washington.
>

Rep. Adam Schiff, D-Calif., the top Democrat on the House Intelligence Committee, has invited Christopher Wylie, the former Cambridge Analytica contractor who first spoke with The Times and The Observer, to appear for an interview with his staff. He said Democrats have also invited the Russian-American researcher Alexandr Kogan, to appear for an interview.

Cambridge Analytica provided documents to the House Intelligence Committee about its work with the Trump campaign last year. The panel also interviewed CEO Alexander Nix over video conference from a Washington law office instead of in person at the Capitol, a move that frustrated committee Democrats. Nix was questioned about the firm’s work with the Trump campaign.

“We need to bring [Nix] back. I also think we need to bring in the other witnesses from Cambridge Analytica that we had asked the majority to previously [agree to],” Schiff said, referencing Democrats’ calls for interviews with other Cambridge Analytica executives and GOP donor Rebekah Mercer, whose father Robert helped create the political data firm.

\"PHOTO:
Photo Illustration by Jaap Arriens/NurPhoto via Getty Images
PHOTO: The Facebook app is seen on a smartphone, Nov. 20, 2017.
>

Facebook has already faced scrutiny and calls for regulation in Washington amid investigations into Russian efforts to disrupt the election using fake news and political ads disseminated on the platform and other social media sites.

Lawmakers, including Warner and Klobuchar, have called for tighter regulations of online political ads and greater disclosure requirements, which Facebook and other tech companies have resisted.

The company has also worked to improve its image in Washington in recent months: Chief operating officer Sheryl Sandberg traveled to Washington last fall to meet with congressional leaders in October amid the House and Senate Intelligence Committee investigations into Russian election meddling.

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