Warner says there are 'enormous amounts of evidence' suggesting Russia collusion

Sen. Mark WarnerMark Robert WarnerSenators take fundraising efforts to Nats playoff games Senate Intelligence report triggers new calls for action on election security Senate Intel report urges action to prevent Russian meddling in 2020 election MORE (D-Va.) said Sunday that there are "enormous amounts of evidence" suggesting collusion between President TrumpDonald John TrumpWHCA calls on Trump to denounce video depicting him shooting media outlets Video of fake Trump shooting members of media shown at his Miami resort: report Trump hits Fox News's Chris Wallace over Ukraine coverage 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 BurrRichard Mauze BurrBlood cancer patients deserve equal access to the cure Senate Intelligence report triggers new calls for action on election security Senate Intel report urges action to prevent Russian meddling in 2020 election 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 ClintonHillary Diane Rodham ClintonVideo of fake Trump shooting members of media shown at his Miami resort: report Ronan Farrow exposes how the media protect the powerful Kamala Harris to Trump Jr.: 'You wouldn't know a joke if one raised you' MORE," he said.

Warner continued that he would reserve his judgement until criminal investigations from special counsel Robert MuellerRobert (Bob) Swan MuellerFox News legal analyst says Trump call with Ukraine leader could be 'more serious' than what Mueller 'dragged up' Lewandowski says Mueller report was 'very clear' in proving 'there was no obstruction,' despite having 'never' read it Fox's Cavuto roasts Trump over criticism of network 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."