A30. The re-definition of “sex” to include “gender identity” in a law that prohibits discrimination “on the basis of sex” would mean that programs receiving federal funds and operating in interstate commerce could not lawfully distinguish a biological female from a males who identify as transgender. This would make it prima facie unlawful to do what is currently permitted, i.e., to have teams and events that are separated on the basis of biological sex. It would also make it prima facie unlawful to use testosterone — a sex-linked trait — as an eligibility criterion for inclusion in girls’ and women’s elite sport, e.g., as is currently required by the NCAA, the USOPC, the IOC, and the national and international sports federations. Both separate-sex sport itself and eligibility criteria based on biological sex and sex-linked traits like testosterone, are currently lawful exceptions to general prohibitions on sex discrimination. For this to remain the case, the Equality Act which passed the U.S. House of Representatives but not the Senate during the 117th Congress (2021-22) and has been reintroduced during the 118th Congress (2023-2024) would need to be amended to provide for an express exception for biological female competitive sport.