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.

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.

A transgender athlete in California won two events at the girls track and field state championship over the weekend.