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.) said Sunday that there are "enormous amounts of evidence" suggesting collusion between President Trump Donald John TrumpBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Military leaders asked about using heat ray on protesters outside White House: report Powell warns failure to reach COVID-19 deal could 'scar and damage' economy MORE's 2016 campaign and Russia.

"Where that evidence leads, in terms of a conclusion — and we still have some of those key people to come back — I'm going to reserve judgment until I'm finished," Warner, the top Democrat on the Senate Intelligence Committee, said on NBC's "Meet the Press."

"There's no one that could factually say there's not plenty of evidence of collaboration or communications between Trump Organization and Russians."

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Warner's comments came in response to a quote from 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.) in which he said there was "no factual evidence" of collusion.

Host Chuck Todd pressed Warner on whether there was an actual crime in play that could precipitate the impeachment of Trump.

"I have never in my lifetime seen a presidential campaign, from a person of either party, have this much outreach to a foreign country and a foreign country that the intelligence community, and our committee has validated, intervened, massively, in our election and intervened with an attempt to help one candidate, Donald Trump, and to hurt another candidate, Hillary Clinton Hillary Diane Rodham ClintonBarr criticizes DOJ in speech declaring all agency power 'is invested in the attorney general' Virginia Democrat blasts Trump's 'appalling' remark about COVID-19 deaths in 'blue states' The Hill's Campaign Report: Biden asks if public can trust vaccine from Trump ahead of Election Day | Oklahoma health officials raised red flags before Trump rally MORE," he said.

Warner continued that he would reserve his judgement until criminal investigations from 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 conclude so that the Intelligence Committee can meet with key figures.

"Those criminal investigations need to conclude, before we get a chance to talk to them," he said.

Trump has repeatedly denied any wrongdoing related to collusion, calling investigations into him a "witch hunt."