Democratic vice presidential nominee Tim Kaine was unable on Sunday morning to explain and verify the authenticity of Hillary Clinton’s purported remarks in leaked transcripts of her paid speeches to Wall Street firms. Despite being asked multiple times if the leaked emails were accurate—and being reminded that he could just ask Clinton—Kaine claimed he had no way of knowing the emails were accurate.

Appearing on CNN’s State of the Union, the Virginia senator echoed the campaign in neither confirming nor disputing the authenticity of the documents that appeared in a trove of Clinton campaign chairman John Podesta’s emails that were hacked and released on Friday by WikiLeaks.

The transcripts validated many of Bernie Sanders’ criticisms of Clinton during the hard-fought Democratic primary—namely that Clinton is too cozy with Wall Street. Sanders has since endorsed her, but some of his supporters continue to believe that Clinton is not fit to be president for that very reason. During the primary, Sanders regularly hammered her on the paid speeches and called on her to release the transcripts.

Host Jake Tapper pressed Kaine on whether Clinton told a Brazilian bank that her “dream is a hemispheric common market, with open trade and open borders,” as the leaked documents suggest. Kaine said he has “no way of knowing” whether Clinton actually said that, but Tapper pushed back: “Well, you could ask her.”

—Andrew Desiderio