(CNN) A Missouri attorney says he turned over to law enforcement hours of privately recorded tapes concerning Republican Gov. Eric Greitens, as the governor faces an investigation into allegations of sexual misconduct and blackmail.

Al Watkins, the lawyer representing a man who claims Greitens threatened the man's ex-wife with blackmail during an extramarital affair, told CNN in a phone interview Monday night that his client was in possession of hours of previously undisclosed audio. Watkins says the recording is perhaps as long as five hours -- and in it, the ex-wife describes sexual interactions she had with Greitens.

CNN has not verified the existence of these additional, previously undisclosed recordings. And it is not clear if the additional tapes -- if they exist -- would further implicate the governor in any wrongdoing beyond the already disclosed affair.

Greitens has vehemently rejected that he blackmailed the woman with whom he had an extramarital affair before becoming governor.

Watkins told CNN on Monday that he gave the entirety of the recordings to the circuit attorney for the city of St. Louis and the FBI. Watkins declined to share any part of the additional recording with CNN, saying that is not his client's wish.

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