03/18/2010 05:12 am ET | Updated May 25, 2011

Tom Coburn: I Didn't Help Negotiate Ensign Affair Pay-Off

Sen. Tom Coburn, R-Okla., told me flatly that he did not offer to broker a million-dollar deal between his Senate colleague, John Ensign, R-Nev., and the family of Ensign's mistress.

Doug Hampton, the husband of a staffer with whom Ensign had an affair, makes the explosive allegation in an interview with "Nightline's" Cynthia McFadden that will air on Monday.

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