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

Sen. Mark WarnerMark Robert WarnerDems reject Barr's offer to view Mueller report with fewer redactions GOP senators divided on Trump trade pushback Hillicon Valley: Trump unveils initiatives to boost 5G | What to know about the Assange case | Pelosi warns tech of 'new era' in regulation | Dem eyes online hate speech bill MORE (D-Va.) said Sunday that there are "enormous amounts of evidence" suggesting collusion between President TrumpDonald John TrumpThorny part of obstruction of justice is proving intent, that's a job for Congress Obama condemns attacks in Sri Lanka as 'an attack on humanity' Schiff rips Conway's 'display of alternative facts' on Russian election interference 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 BurrGOP senator: 'No problem' with Mueller testifying Collins backs having Mueller testify Graham says he's 'not interested' in Mueller testifying 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 ClintonThorny part of obstruction of justice is proving intent, that's a job for Congress Nadler: I don't understand why Mueller didn't charge Donald Trump Jr., others in Trump Tower meeting Kellyanne Conway: Mueller didn't need to use the word 'exoneration' in report MORE," he said.

Warner continued that he would reserve his judgement until criminal investigations from special counsel Robert MuellerRobert Swan MuellerSasse: US should applaud choice of Mueller to lead Russia probe 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."