Los Angeles (CNN) -- Shock jock Howard Stern's addition as a judge on NBC's "America's Got Talent" could cost advertisers "countless millions of dollars in customer goodwill," a parents group is warning. "NBC's decision to add Mr. Stern to AGT will likely result in a sharp increase in explicit content, and we urge you to be mindful when considering a media buy," Tim Winter, president of the Parents Television Council, said in a letter to 91 companies that have previously bought time on the show. Stern, whose show is heard on Sirius XM Radio, was hired to replace CNN host Piers Morgan as a judge for the seventh season of the highly rated talent competition. The show, which returns to TV on May 14, is mostly broadcast live.
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NEW: Howard Stern releases video of audience members at a taping in his defense
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Stern will likely bring explicit content to "America's Got Talent," a group warns
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The Parents Television Council aims to protect children from excess in entertainment
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Stern is scheduled to debut as a judge on May 14
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When Winter's group issued a statement in December calling @placeholder's hiring "an act of desperation for a flailing network," Stern responded with a call to Morgan's CNN show.
Howard Stern
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Howard Stern
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When Winter's group issued a statement in December calling Stern's hiring "an act of desperation for a flailing network," @placeholder responded with a call to Morgan's CNN show.
Howard Stern
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Howard Stern
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"I assure you that every advertiser on 'America's Got Talent' will be held publicly accountable for underwriting any of the inevitably vile antics of @placeholder," he said.