The Senate Intelligence Committee’s top Democrat is pushing for another hearing on how tech firms are dealing with Russian interference in the 2016 election.

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Sen. Mark Warner Mark Robert WarnerDemocrats call for declassifying election threats after briefing by Trump officials It's time to upgrade benefits Intelligence chief says Congress will get some in-person election security briefings MORE (D-Va.) has said before that he was interested in bringing technology executives back before his committee after representatives from Facebook, Twitter and Google testified before the Senate Intelligence Committee in November.

Two sources with knowledge of the matter told The Hill that Warner is now taking steps to make the hearing happen.

The focus of the hearing expected to be on how major internet platforms were manipulated during the election and the threat it could happen again.

Details of the hearing, including a date and the companies to be invited have yet to be determined, the sources said. Facebook, Twitter and Google, who all testified in the November hearing, are among the companies that could be invited back.

Tumblr, which is owned by Oath, and Reddit were also used Russian trolls attempting to interfere in the 2016 election. Warner and the Senate Intelligence Committee have shown some interest in their role in election meddling efforts, but have primarily focused on Facebook, Twitter and Google’s platforms.

A spokesperson for Senate Intelligence 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.), who gets the final say in what hearings the committee holds, did not comment on Warner's efforts.

“Chairman Burr has stated that the committee is examining social media influence as part of it investigation, but we don’t have any details to announce at this time,” a spokesperson for Burr, wrote in an email.

A spokesperson for Warner, also declined to confirm or comment on the specific details of the hearing but said that Warner always intended to bring the companies in for a follow-up.

It’s unclear if technology companies would attend if invited. Representatives from Facebook, Twitter and Google have shown up to hearings held by the Senate Commerce Committee as well as the House Judiciary Committee, but all three skipped a hearing on alleged anti-conservative bias in tech in April. They did, however, attend the follow-up hearing on the subject in July.

Facebook CEO Mark Zuckerberg Mark Elliot ZuckerbergHillicon Valley: FBI, DHS warn that foreign hackers will likely spread disinformation around election results | Social media platforms put muscle into National Voter Registration Day | Trump to meet with Republican state officials on tech liability shield Facebook to 'restrict the circulation of content' if chaos results from election: report 2.5 million US users register to vote using Facebook, Instagram, Messenger MORE also attended two congressional hearings in April in the wake of the Cambridge Analytica scandal in which it was revealed that the British research firm used by the Trump campaign improperly harvested data of 87 million Facebook users.

President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE sparked controversy last week during a press conference with Russian President Vladimir Putin when he said he believed his denials of interference despite the conclusions of the U.S. intelligence community.

Trump tried to walk those remarks back the next day, saying that he misspoke and believed the intelligence community's assessment of Russian involvement. But he also added that the hacks could have been by "other people."

Harper Neidig contributed.