Young women demonstrate outside the US Supreme Court as the court upheld state laws barring transgender athletes from competing in girls’ and women’s school sports in Washington, DC, on June 30, 2026. (Photo by Alex WROBLEWSKI / AFP)

The US Supreme Court on Tuesday upheld state laws barring transgender athletes from competing in girls’ and women’s school sports, delivering a major victory to conservatives in one of the country’s most fiercely contested culture-war battles.

The decision allows Idaho, West Virginia and more than two dozen other Republican-led states to enforce measures requiring students to compete in public school and college teams according to their sex assigned at birth rather than their gender identity.

The ruling is the latest sign of the conservative-dominated court’s willingness to side with states on the issue, following last year’s decision upholding Tennessee’s ban on gender-affirming care for minors.

The cases before the court were brought by transgender students who argued that the bans violated the US Constitution’s equal protection guarantee and Title IX, the federal civil rights law barring sex discrimination in education.