An undercover video forces NPR's CEO and president Vivian Schiller to resign.

NPR's CEO and president, Vivian Schiller, has been forced to resign, the radio broadcaster's media correspondent reported Wednesday, following an undercover sting in which a senior executive was videotaped describing Tea Party members as "racist."

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A statement from the chairman of NPR's board of directors, Dave Edwards, said the board had accepted Vivian Schiller's resignation "with deep regret." The resignation was effective immediately.

"I recognize the magnitude of this news — and that it comes on top of what has been a traumatic period for NPR and the larger public radio community," he said.

While the board's statement said Vivian Schiller had resigned, David Folkenflik, NPR's media correspondent, said in messages on Twitterthat she was forced to do so.

"The board for NPR NEWS has just ousted CEO Vivian Schiller in the wake of video sting by conservative activist of a top exec," he said.

Joyce Slocum, SVP of legal affairs and general counsel, has been appointed interim CEO.

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