Sen. Tim Kaine Timothy (Tim) Michael KaineButtigieg stands in as Pence for Harris's debate practice Trump meets with potential Supreme Court pick Amy Coney Barrett at White House Names to watch as Trump picks Ginsburg replacement on Supreme Court MORE (D-Va.) on Thursday blasted retired Lt. Gen. Michael Flynn, President-elect Donald 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's pick for national security adviser, for spreading conspiracy theories.

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In an interview Thursday with CNN, the former vice presidential nominee expressed concern over Flynn serving in the president-elect's administration and raised questions about his judgment.

"The general I'm worried about is Gen. Flynn," Kaine said.

"Gen. Flynn's trafficking in conspiracy stories that a fourth grader would find incredible suggests either that he's highly gullible or that he's so consumed with malice that he loses his ability to judge what's fact and what's fiction."

Kaine said during the interview that Flynn has shown he doesn't have the judgment to serve in the position.

"Having a national security adviser who has demonstrated either such gullibility or such malice in charge of offering advice to the president on the critical national security issues of the day," Kaine said, "I think, is highly highly troubling."

Flynn in the past has pushed unsubstantiated stories linking former Democratic presidential nominee Hillary Clinton Hillary Diane Rodham ClintonButtigieg stands in as Pence for Harris's debate practice Senate GOP sees early Supreme Court vote as political booster shot Poll: 51 percent of voters want to abolish the electoral college MORE to underage sex rings.

“U decide - NYPD Blows Whistle on New Hillary Emails: Money Laundering, Sex Crimes w Children, etc...MUST READ!” Flynn tweeted six days before the election, linking to a story that falsely claimed New York police had found evidence linking Clinton and her senior staff to the crimes.

Flynn has also retweeted theories that Clinton “waged war” on the Roman Catholic Church and that President Obama “laundered” billions of dollars in cash to terrorists.