Senate Commerce Committee Chairman John Thune John Randolph ThuneGraham: GOP will confirm Trump's Supreme Court nominee before the election Tumultuous court battle upends fight for Senate What Senate Republicans have said about election-year Supreme Court vacancies MORE (R-S.D.) on Friday called on Facebook chief executive Mark Zuckerberg Mark Elliot Zuckerberg2.5 million US users register to vote using Facebook, Instagram, Messenger Hillicon 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 MORE to testify before his committee over the mishandling of user data.

“On a bipartisan basis, we believe Mr. Zuckerberg’s testimony is necessary to gain a better understanding of how the company plans to restore lost trust, safeguard users’ data, and end a troubling series of belated responses to serious problems,” Thune wrote in a letter along with the panel's top Democrat, Sen. Bill Nelson Clarence (Bill) William NelsonDemocrats sound alarm on possible election chaos Trump, facing trouble in Florida, goes all in NASA names DC headquarters after agency's first Black female engineer Mary W. Jackson MORE (Fla.), on Friday.

The letter comes after reports that Cambridge Analytica, a British data firm that was also hired by President Trump Donald John TrumpBubba Wallace to be driver of Michael Jordan, Denny Hamlin NASCAR team Graham: GOP will confirm Trump's Supreme Court nominee before the election Southwest Airlines, unions call for six-month extension of government aid MORE's campaign, accessed data from 50 million Facebook accounts without those users' consent.

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Facebook representatives had briefed Commerce Committee staff on Thursday about the matter, but that did little to assuage lawmaker.

Sen. Richard Blumenthal (D-Conn.), who sits on the committee, said he still had many questions about Facebook’s dealings with Cambridge Analytica after attending the meeting.

"With all due respect to the people in this room, they can't commit the company,” Blumenthal told reporters after the meeting. “Someone needs to appear before the public and commit the company in public under oath to what it's going to do to prevent this kind of egregious breach of trust in the future."

The Commerce Committee's call for Zuckerberg to testify comes after House

House Energy and Commerce Committee leaders formally invited the Facebook founder and CEO to testify.

Lawmakers from both parties have blasted Facebook for its handling of the Cambridge Analytica controversy.