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UNITED STATES - FEBRUARY 28: From left, Olympic gold medalists Adam Nelson and Michael Phelps, and Travis Tygart, CEO of the U.S. Anti-Doping Agency, appear before a House Energy and Commerce Subcommittee on Oversight and Investigations hearing in Rayburn Building on ways to strengthen the international anti-doping system, February 28, 2017. Phelps is a swimmer and Nelson a shot putter. (Photo By Tom Williams/CQ Roll Call)

UNITED STATES - FEBRUARY 28: From left, Olympic gold medalists Adam Nelson and Michael Phelps, and Travis Tygart, CEO of the U.S. Anti-Doping Agency, appear before a House Energy and Commerce Subcommittee on Oversight and Investigations hearing in Rayburn Building on ways to strengthen the international anti-doping system, February 28, 2017. Phelps is a swimmer and Nelson a shot putter. (Photo By Tom Williams/CQ Roll Call)

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