At the behest of CBS, an adviser to John Kerry said he talked to a central figure in the controversy over President Bush's National Guard service shortly before disputed documents were released.

Joe Lockhart denied any connection between the presidential campaign and the papers. Lockhart, the second Kerry ally to confirm contact with retired Texas National Guard officer Bill Burkett, said he made the call at the suggestion of CBS producer Mary Mapes.

"He had some advice on how to deal with the Vietnam issue and the Swift Boat" allegations, Lockhart said Monday, referring to GOP-fueled accusations that Kerry exaggerated his Vietnam War record. "He said these guys play tough and we have to put the Vietnam experience into context and have Kerry talk about it more."

Lockhart said Mapes asked him the weekend before the story broke to call Burkett. "She basically said there's a guy who is being helpful on the story who wants to talk to you," Lockhart said, adding that it was common knowledge that CBS was working on a story raising questions about Bush's Guard service. Mapes told him there were some records "that might move the story forward. She didn't tell me what they said."