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 (Va.), the top Democrat on the Senate Intelligence Committee, broke on Tuesday with 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's (R-N.C.) assessment that the panel had not found evidence of collusion based on its findings thus far.

"Respectfully, I disagree," Warner said, according to CNN. "I'm not going to get into any conclusions I've reached because my basis of this has been that I'm not going to reach any conclusion until we finish the investigation. And we still have a number of the key witnesses to come back."

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Burr told CBS News last week that "based on the evidence" the committee has seen so far, there is nothing to suggest that members of 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's campaign and the Russian government colluded during the 2016 election.

The split in public comments between Burr and Warner marked a rare instance of a partisan divide between the two committee leaders, who have been conducting a bipartisan investigation into Russian interference in the 2016 election.

NBC News reported Tuesday that the committee is nearing the end of its investigation having uncovered no direct evidence of collusion, but some senators on the panel were less committal.

Sen. Angus King Angus KingGovernment watchdog recommends creation of White House cyber director position Democrats step up hardball tactics as Supreme Court fight heats up Shakespeare Theatre Company goes virtual for 'Will on the Hill...or Won't They?' MORE (I-Maine), a member of the Intelligence Committee, told The Hill when asked about the NBC report that the panel "has not concluded anything."

"Several of the individual members have made statements, but I certainly am not prepared to make a statement as to what was found or not found," he said.

Warner told CNN that lawmakers are still hoping to speak with a few witnesses, including Trump's former personal attorney Michael Cohen. The longtime Trump associate was scheduled to testify Tuesday, but postponed his appearance, citing medical reasons after a recent shoulder surgery.

"What we do know, and it's part of the public record, there's never been a campaign in American history that during the campaign and its aftermath that the campaign folks affiliated with the campaign had as many ties with Russia as the Trump campaign did," Warner said.

Trump has repeatedly maintained that his campaign did not collude with Russia, and he has decried the federal investigation into the 2016 election led by 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, calling it a "witch hunt." That probe has thus far implicated six former Trump associates and dozens of Russians.

Trump last week seized on Burr's remarks about the committee's findings. The president highlighted the senator's comments as proof that his campaign did not collude, but did not mention that Burr was referring to evidence the committee has reviewed to date.

Senator Richard Burr, The Chairman of the Senate Intelligence Committee, just announced that after almost two years, more than two hundred interviews, and thousands of documents, they have found NO COLLUSION BETWEEN TRUMP AND RUSSIA! Is anybody really surprised by this? — Donald J. Trump (@realDonaldTrump) February 10, 2019

Burr has periodically said he has seen no evidence of collusion between the campaign and the Russian government, however he has noted he will wait to make a final judgment until the investigation is fully completed.