Facebook says it will release the more than 3,000 political ads purchased by Russian actors on its platform during the 2016 campaign to congressional investigators on Monday.

The move comes after Facebook faced pressure from federal lawmakers such as Sen. 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.) and Rep. Adam Schiff Adam Bennett SchiffTop Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence Overnight Defense: Top admiral says 'no condition' where US should conduct nuclear test 'at this time' | Intelligence chief says Congress will get some in-person election security briefings Overnight Defense: House to vote on military justice bill spurred by Vanessa Guillén death | Biden courts veterans after Trump's military controversies MORE (D-Calif.). They are the highest ranking Democrats in the Senate and House Intelligence Committees, respectively.

While they have said that they’re pleased with Facebook’s decision to release the ads to investigators, they note that they would still like more details.

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A spokesperson for Warner said he’s interested in the activity of the social media accounts through which the ads were purchased. His office believes this could yield more information on how Russians may have sought to influence the election and sow discord among Americans more than through just the advertisements.

"I think we may just be seeing the tip of the iceberg. [Facebook has] had a fairly narrow search,” Warner said last month.

The Senate Intelligence Committee sent invitations to Facebook, Google and Twitter last week to testify before a Congressional panel on Nov. 1 regarding potential Russian interference in the 2016 election. None of the companies have said they will attend, but after Twitter briefed the House and Senate Intelligence Committees on Thursday, Warner said he may subpoena representatives from the firms to appear, if necessary.

The House Intelligence Committee says it will also hold a public hearing on the matter in October, and would like the three companies to be present as well.

For its part, Facebook said it’s constantly updating its systems as it hunts for malicious activity and that it has been forthcoming in the information it has provided so far.

Facebook CEO Mark Zuckerberg had previously announced that the company would share its findings with federal investigators but did not specify when. Some lawmakers have already seen the ads. Senate Intelligence Committee Chairman Richard Burr Richard Mauze BurrRep. Mark Walker says he's been contacted about Liberty University vacancy Overnight Defense: Trump rejects major cut to military health care | Senate report says Trump campaign's Russia contacts posed 'grave' threat Senate report describes closer ties between 2016 Trump campaign, Russia MORE (R-N.C.) told reporters last week that his staff had reviewed some of the ads.

Burr said he thought that the ads targeted both conservatives and liberals equally.

At the beginning of September, Facebook revealed that a Kremlin-linked group called the Internet Research Agency had purchased $100,000 in political ads during the 2016 presidential campaign.

Later reports from The Daily Beast and The Washington Post found that at least some of the roughly 3,000 advertisements purchased by the group were designed to affect political opinion and tug at social fault lines in the U.S. Some ads suggested that Black Lives Matter was a political threat. Others encouraged Americans to participate in pro-Trump rallies.