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Former longtime Clinton confidant Mark Penn said the federal probe into Russian meddling during the 2016 election is "irretrievably tainted."

"I spent a year fighting Ken Starr," Penn said of the special prosecutor who investigated President Clinton. "This [Trump] investigation had no foundation."

He said it is based on what he called the "fruits of the poisonous tree."

"This whole thing was corrupt," Penn said. "I don't think we should waste another year here [on this]."

Penn doubted whether fired FBI Director James Comey was truthful when he said he didn't know nor care to know who paid for the Trump dossier.

He said Trump's team is on defense and "they need offense."

He suggested that the probe should be challenged in court so that the Trump team will have "full [legal] discovery" of the probe's "foundation."

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