New York, June 29 Former US presidential candidate John Edwards and his former mistress, Rielle Hunter, once recorded a sex tape, according to someone who has seen his former aide Andrew Young's book proposal.

Young was reported to have signed a deal with St. Martin's Press for his proposal, which allegedly includes his claim that married Edwards was the father of Hunter's infant and not him - contrary to his public statement last year.

According to the book pitch, Young apparently found the purported tape featuring Edwards and Hunter engaged in sexual acts, reports the New York Daily News.

Young's proposal was also said to include claims that Hunter confided to him that she and Edwards had conversations about getting married if the leader's cancer-stricken wife, Elizabeth, died.

Elizabeth Edwards and Young's agent offered no comment while Hunter could not be reached. (ANI)