Warner: Every week another shoe drops in Russia investigation

Sen. Mark WarnerMark Robert WarnerSunday shows preview: Trump readies for meeting with Putin Senate Dems tell Trump: Don't meet with Putin one-on-one Top Democrats request meeting with intel chief over sharing of classified info MORE (D-Va.), the top Democrat on the Senate Intelligence Committee, said Sunday that "each week another shoe drops" indicating alleged collusion between the Trump campaign and Russia.

"This president has been obsessed with this investigation, always saying, 'there is nothing there,' " Warner told host Jake Tapper on CNN's "State of the Union."

"But each week another shoe drops where we see more evidence of continuing outreach from Russians and some response from the Trump campaign and Trump individuals," he continued.

His comments come shortly after President Trump's former national security adviser, Michael Flynn, pleaded guilty to lying to the FBI about his contacts with then-Russian Ambassador Sergey Kislyak.

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Warner challenged Trump's claim that Flynn had "nothing to hide."

"Clearly, Gen. Flynn and his son were in a great deal of legal jeopardy. The fact that Gen. Flynn was only charged with one account, a major account, lying to the FBI, I believe means that there is many more stories that Gen. Flynn will have to tell about his time during the campaign and during the transition. So I think there's more to come and what we see here is this president, whenever any of his close associates falls into problems, he tries to disassociate," he continued.

Trump on Saturday tweeted a defense of his former national security adviser, who was fired after revelations surfaced that he lied to Vice President Pence about his conversations with Kremlin officials.

"I had to fire General Flynn because he lied to the Vice President and the FBI. He has pled guilty to those lies. It is a shame because his actions during the transition were lawful. There was nothing to hide!" Trump tweeted on Saturday in defense of his former White House aide.

Trump has repeatedly denied wrongdoing, telling reporters on Saturday that there "there's been absolutely no collusion."