(CNN) A top adviser to Donald Trump believes there's nothing anyone can do to get Hillary Clinton to tell the truth about her emails. Not even torture.

Barry Bennett, a senior adviser to Trump's campaign, alleged Friday on CNN that Clinton has repeatedly lied about her email use during her time as secretary of state.

"She has continued to lie about it. She told us the lawyers signed off on it. The inspector general said that's not true," Bennett said. "She said she would cooperate with all the investigations -- she stonewalled the IG and now everybody is taking the Fifth."

He added: "You couldn't get the truth out of Hillary if you waterboarded her."

The comment left CNN anchor Kate Bolduan, co-host of "At This Hour," taken aback.

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