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WASHINGTON, DC - FEBRUARY 28:  American swimmer and Olympic gold medalist Michael Phelps testifies during a hearing before the Oversight and Investigations Subcommittee of House Energy and Commerce Committee February 28, 2017 on Capitol Hill in Washington, DC. The subcommittee held a hearing on "Ways to Improve and Strengthen the International Anti-Doping System."  (Photo by Alex Wong/Getty Images)
WASHINGTON, DC - FEBRUARY 28:  American swimmer and Olympic gold medalist Michael Phelps testifies during a hearing before the Oversight and Investigations Subcommittee of House Energy and Commerce Committee February 28, 2017 on Capitol Hill in Washington, DC. The subcommittee held a hearing on "Ways to Improve and Strengthen the International Anti-Doping System."  (Photo by Alex Wong/Getty Images)

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    Michael Phelps: Doping is too prevalent

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Michael Phelps: Doping is too prevalent

23-time Olympic gold medalist Michael Phelps tells CNN's Coy Wire that doping is too prominent in sport and doesn't know if he's ever swum in a clean race.

Michael Phelps: Doping is too prevalent

23-time Olympic gold medalist Michael Phelps tells CNN's Coy Wire that doping is too prominent in sport and doesn't know if he's ever swum in a clean race.