What happened: The campaign calls for female-only eligibility in the WNBA. Barkley’s signature adds his support to Sophie Cunningham’s position on transgender athletes in women’s competition.

Why it matters: The endorsement raises the campaign’s profile as eligibility rules draw scrutiny across women’s sports. The dispute now includes prominent figures from basketball and tennis.

What to watch: Watch for a WNBA response and any additional high-profile signatures.