The Trump administration asked the Supreme Court to take up the case after U.S. District Judge Ana Reyes halted the ban in March, siding with transgender service members and ruling the policy was unlawfully discriminatory, and a federal appeals court then refused to reinstate it.

The US Department of Justice is pressuring California’s public high school sports authority to abandon a policy allowing transgender girls to compete on women’s teams, following a transgender athlete’s first-place wins at the state track and field championships.

AB Hernandez, a transgender athlete, has stirred controversy and drawn national attention over competing in a girls track and field championship. NBC News' David Noriega explains how Hernandez was able to compete under a new California policy.