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.

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

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.