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 he believes Republicans "would like to have known" 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 was trying to do business with the Russians when he was the party's presumptive presidential nominee in 2016.

"I gotta believe that most Republicans who were about to nominate Donald Trump in the summer of 16 would probably have thought it was a relevant fact — they would like to have known — that then-candidate Trump was still trying to do with business with Russia," Warner said on CNN's "State of the Union."

Democratic Sen.@MarkWarner says he’s “not aware” if the White House knew Michael Cohen lied to Congress about President Trump's knowledge of the proposed Trump Tower project in Moscow #CNNSOTU https://t.co/bRGQZcjkeC pic.twitter.com/lXCCBtz8RH — State of the Union (@CNNSotu) December 2, 2018

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The senator's comments came after Trump's former personal attorney, Michael Cohen, pleaded guilty last week to lying to Congress about the negotiations between the Trump Organization and Russia to build a Trump Tower in Moscow.

Those negotiations continued until at least June of 2016, when Trump was the presumptive Republican nominee for president.

Trump last week defended the negotiations, writing in a tweet that they were "very legal & very cool."

Warner on Sunday also said that he would "reserve judgment" over whether the Trump campaign colluded with the Russians in 2016, but added that it's "pretty clear" that the Russians were working with Trump campaign officials.

"It’s pretty clear that the Russians, not only did they hack into the emails and not only had they stolen other information, but they were very forward leaning in terms of offering this information to the Trump campaign and it appears that a number of senior Trump officials or Trump campaign officials continue to lie about those kind of contacts," Warner said.