The Democratic leader of the House Intelligence Committee on Tuesday said that his panel is pursuing evidence to back up or dispute Michael Cohen Michael Dean CohenA huge deal for campaign disclosure: Trump's tax records for Biden's medical records Our Constitution is under attack by Attorney General William Barr Eric Trump says he will comply with New York AG's subpoena only after Election Day MORE’s claims that President Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate MORE knew his longtime friend Roger Stone Roger Jason StoneThe agony of justice Our Constitution is under attack by Attorney General William Barr Justice IG investigating Stone sentencing: report MORE was communicating with WikiLeaks about hacked Democratic emails before the organization released them in 2016.

“That is a very important investigative thread,” House Intelligence Committee Chairman Adam Schiff Adam Bennett SchiffChris Matthews ripped for complimenting Trump's 'true presidential behavior' on Ginsburg Trump casts doubt on Ginsburg statement, wonders if it was written by Schiff, Pelosi or Schumer Top Democrats call for DOJ watchdog to probe Barr over possible 2020 election influence MORE (D-Calif.) told reporters when asked about Cohen’s allegations during a breakfast event hosted by the Christian Science Monitor in Washington, D.C.

“We are going to be and have been pursuing documents that would allow us to corroborate that testimony,” Schiff said.

Cohen, who worked for Trump for roughly a decade as a Trump Organization executive and later his personal attorney, delivered explosive congressional testimony last month during which he claimed Trump knew in advance of WikiLeaks's plans to release emails stolen from the Democratic National Committee. The intelligence community has tied the hacked email releases to a broader plot by the Russian government to interfere in the 2016 election.

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Cohen told lawmakers in February that before the 2016 Democratic National Convention he heard Stone tell Trump during a speakerphone conversation that there would be a “massive dump” of emails damaging to Democratic candidate Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE’s campaign.

“Mr. Stone told Mr. Trump that he had just gotten off the phone with Julian Assange and that Mr. Assange told Mr. Stone that, within a couple of days, there would be a massive dump of emails that would damage Hillary Clinton’s campaign,” Cohen said. “Mr. Trump responded by stating to the effect of ‘wouldn’t that be great.’ ”

Stone has denied Cohen’s account.

Cohen has twice since met privately with Schiff’s committee as part of its ongoing probe into Russian interference, giving the lawmakers documents to supplement his testimony. Schiff and his colleagues have been tight-lipped about the specifics of Cohen’s closed-door appearances.

On Tuesday, Schiff would not say whether the committee was specifically pursuing phone records to corroborate Cohen’s account of Trump’s knowledge of WikiLeaks’s plans.

“I don’t want to go into specifics, but we are going to be looking at any documentary evidence,” Schiff said. “That could take a number of forms, from phone records, to social media records, to other documentary evidence.”

The Democrat added that the committee might also seek testimony from other witnesses who can “either prove or disprove” what Cohen testified to.

WikiLeaks has disputed Cohen’s account, and Republicans have raised questions about Cohen’s trustworthiness, noting he has previously pleaded guilty to lying to Congress. Cohen will report to prison in May to serve a three-year sentence for making false statements and other crimes. He has cooperated with special counsel Robert Mueller Robert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE’s ongoing investigation into Russian interference.

Stone made various public statements before the 2016 election that appeared to forecast WikiLeaks’s releases, but has maintained he never made direct contact with the organization and instead had a back channel to the group.

Stone has been indicted in connection with Mueller’s investigation for lying to Congress about his conversations regarding WikiLeaks, obstruction and witness tampering. Stone has pleaded not guilty to the charges and is fighting them in federal court in D.C.