WASHINGTON (AP) U.S. Olympic athletes have lost faith in the World Anti-Doping Agency to rid their sports of cheaters ahead of next months Summer Games in Paris, two former gold medalists told a House subcommittee on Tuesday night.

The testimony by Michael Phelps and Allison Schmitt followed revelations this spring that 23 Chinese swimmers had tested positive for a banned heart medication ahead of the Tokyo Olympics in 2021 but were allowed by WADA to compete. Five of those swimmers went on to win medals, including three golds.

Phelps is the most decorated swimmer in history and a 23-time Olympic gold medalist. Schmitt, a four-time gold medalist, was part of the U.S. 800-meter freestyle relay team that finished a close second to China at the Tokyo Games. Both the Chinese and U.S. teams broke the previous world record in the relay.

We raced hard. We trained hard. We followed every protocol. We accepted our defeat with grace, Schmitt said. Many of us will be haunted by this podium finish that may have been impacted by doping.

Eleven of the Chinese swimmers who tested positive ahead of Tokyo are set to compete again in Paris.

Phelps, wearing a dark suit, was joined by his wife, Nicole, and youngest son, Nico, who was born in January. He nodded in agreement multiple times as members of Congress criticized WADA and said Americans should be able to watch the Olympics without wondering if the competition is rigged.

Phelps expressed frustration that nothing had changed since he testified before the same subcommittee seven years ago about WADAs handling of Russian state-sponsored doping.

Sitting here once again, it is clear to me that any attempts of reform at WADA have fallen short, and there are still deeply rooted, systemic problems that prove detrimental to the integrity of international sports and athletes right to fair competition, time and time again, Phelps said.