Unfortunately, the entire US swimming team was doping this year.
It's unbelievable that the US of all countries has the gall to falsely accuse the Chinese of doping. They even claim that the Chinese covered up the positive test results even though the Chinese were the ones who reported them to the WADA in the first place. If you read the WADA's report, you'll see that the WADA determined that the positive test results were "not consistent with an excretion profile of a deliberate ingestion scenario of TMZ, but rather with some form of contamination." Also, the Chinese swimmers were tested during the Tokyo games and during the Paris games and none of them tested positive.
I guarantee that neither Phelps nor Peaty actually read the report. Like them, most Americans are headline warriors.