Olympic swimming legend Michael Phelps appeared before Congress Tuesday to urge it to act against doping in Olympic sports. Earlier this year, a report in The New York Times revealed that 23 Chinese swimmers who tested positive for a banned substance were allowed to compete in the 2021 Tokyo Olympic Games. The incident was hidden from the public after a deal between Chinese officials and the World Anti-Doping Agency, which oversees drug testing, according to the report. During an appearance before the Oversight and Investigation Subcommittee of the House Energy and Commerce Committee that was …