Sen. Ed Markey Edward (Ed) John MarkeySchumer: 'Nothing is off the table' if GOP moves forward with Ginsburg replacement Democrats see fundraising spike following Ginsburg death Democratic senator calls for eliminating filibuster, expanding Supreme Court if GOP fills vacancy MORE (D-Mass.) called on Facebook founder and CEO 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 to come testify before Congress on Wednesday in response to Zuckerberg's statement admitting the platform's responsibility in a privacy controversy.

Markey joined a number of lawmakers in Congress who have sought testimony from the Facebook head following reports detailing user data abuse by research firm Cambridge Analytica.

"You need to come to Congress and testify to this under oath," Markey said in response to Zuckerberg's comments earlier Wednesday.

Zuckerberg admitted that the company "made mistakes" by not stopping the firm from improperly using the data of millions of users without their consent for political research. The British research group was a consultant for 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 2016 campaign and devised targeted political ads based on the data of nearly 50 million users.

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Officials from Facebook are set to brief members of the House and Senate Intelligence committees, the House Energy and Commerce Committee and the Senate Commerce, Science and Transportation Committee, and the House and Senate Judiciary committees on its data practices and relationship with Cambridge Analytica.

But lawmakers are indicating they won't be satisfied with appearances from other Facebook employees.

The statement by Markey, a member of the Energy and Commerce committee and its subcommittee on oversight and investigations, for Zuckerberg himself to testify echoed calls from Sen. Jerry Moran (R-Kan.), John Kennedy John Neely KennedyMORE (R-La.), 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 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 (D-Va.).

Facebook has already turned over information on the data usage that it said violated its user agreement to Congress, as well as the special counsel investigating Russian interference in the general election. The social media giant has previously testified before committees on Russian operatives' use of inflammatory political content and fake news to attempt to sway the election.