The largest high school district in California by enrollment and land area voted 3-2 on Monday to adopt a Title IX resolution restricting girls’ sports to female students only.

Kern High School District, which serves over 40,000 students across 31 schools, becomes the 16th district or board in the state to defy California’s policy protecting trans athletes. The move comes as the U.S. Department of Justice sues the state for alleged Title IX violations.

The resolution was authored by Chino Valley Unified Board President Sonja Shaw, who has pushed similar measures elsewhere. “Boys are boys. Girls are girls,” she said. “It’s time to put fairness, truth, and common sense back into education.”

California has allowed trans athletes to compete in girls’ sports since 2013. However, Trump’s February executive order, “Keeping Men Out of Women’s Sports,” and subsequent DOJ lawsuits against California, Maine, and potentially Minnesota, have escalated the conflict.

The issue has also sparked lawsuits in Riverside County, where female athletes say they lost roster spots and titles to trans competitors.

Governor Gavin Newsom has called male participation in girls’ sports “unfair,” but noted that state law and the California Interscholastic Federation (CIF) — which refused to comply with Trump’s order — are beyond his direct authority. He said any change would require legislative action.

A recent Public Policy Institute of California survey found a majority of residents oppose trans athletes competing in girls’ sports.