The International Olympic Committee announced Thursday it will bar transgender women from competing in women’s events. The ban will take effect at the 2028 Los Angeles Games. The policy requires all female athletes to undergo a mandatory gender screening, which is a cheek swab or blood test to detect the presence of the SRY gene, associated with sexual development typically seen in males. That’s despite the fact that the scientist who discovered the SRY gene has publicly opposed using it to determine biological sex. The IOC’s decision follows President Trump’s executive order last year barring transgender women from competing on women’s college sports teams.