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SCOTUS: Women Lawmakers Back Biological Sex for Girls’ Sports

207 Republican women lawmakers filed an amicus brief to SCOTUS backing state laws on biological sex in women's sports, challenging transgender athlete inclusion. Read more.

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207 Republican Women Lawmakers Ask SCOTUS to Protect Girls’ Sports, Backing Biological-Sex Rules in Idaho, West Virginia Cases

A coalition of 207 Republican women state lawmakers from 42 states filed an amicus brief urging the U.S. Supreme Court to uphold Idaho’s and West Virginia’s laws that limit participation in girls’ and women’s sports to biological females.

Key takeaways

  • Who: 207 Republican women lawmakers from 42 states filed the brief, according to reporting and the organizing group. See AOL reporting and the Kansas Family Foundation press release.
  • What: The brief asks the Supreme Court to uphold Idaho’s Fairness in Women’s Sports Act and a related West Virginia law that bar males who identify as female from competing on female teams.
  • When: The Supreme Court will hear oral arguments on the two cases on Tuesday.
  • Why: The signers argue eligibility should be based on biological sex to preserve fairness, Title IX opportunities, safety and privacy for female athletes.

Who organized the brief and notable signers

The amicus brief was organized and filed by Idaho Rep. Barbara Ehardt, the sponsor of Idaho’s Fairness in Women’s Sports Act (H.B. 500). The filing lists more than 200 female legislators and 38 state-level family-policy groups and allied organizations as supporters. Reporting and the organizing group’s announcement are available via AOL and the Kansas Family Foundation.

Notable names identified in coverage include Rep. Laurel Libby (Maine); Minnesota House Speaker Lisa Demuth; Iowa Senate President Amy Sinclair; Missouri Sen. Cindy O’Laughlin; Alaska Sen. Shelly Hughes; Kansas Rep. Kristy Williams; and North Dakota Sen. Janne Myrdal.

The brief was drafted with assistance from the Kansas Family Foundation and True North Legal. Named co-authors include Brittany Jones and Renee Carlson, per the organizers’ materials.

The Court agreed to hear two related challenges—one from Idaho and one from West Virginia—both of which concern laws that bar males who identify as female from participating in girls’ and women’s sports. Lower courts issued differing rulings: for example, a Ninth Circuit panel found Idaho’s law unconstitutional; the state appealed and the issue is now before the high court.

Idaho’s law at issue, the Fairness in Women’s Sports Act, was enacted March 30, 2020. Civil-rights groups, including the ACLU, sued, arguing that the law discriminates against transgender students and violates federal protections.

Main claims and reasoning

The lawmakers’ brief advances several themes:

  • Biological basis of women’s sports: The brief argues separate women’s sports exist because innate biological differences affect athletic performance and that sex-based classifications meet the Supreme Court’s “exceedingly persuasive” standard for sex distinctions.
  • Fairness and competitive equity: Supporters contend that allowing males who identify as female introduces physical advantages—size, speed and strength—that can alter competitive outcomes. The brief states,

    “it only takes one male participant in a girl’s only event or team to change the outcome of an entire female sporting event.”

  • Protection of Title IX opportunities: The filing frames its position as consistent with Title IX’s original purpose, warning that gender-identity eligibility could reduce scholarships, roster spots and podium opportunities for female athletes.
  • Safety and privacy: The brief and allied statements raise concerns about safety and privacy in locker rooms and intimate facilities; those concerns appear in related legal filings and advocacy materials.

Language and emphasis

The coalition uses terms such as “biological males” and “males who identify as females” and emphasizes “embodied athletes, not identities” to argue for a sex-based approach to eligibility. The brief warns that relying on gender identity would “fundamentally change and erase women’s and girls’ sports altogether.”

Counterarguments from Democrats and civil‑rights groups

This brief is one of many amicus filings on both sides. A separate brief from 130 Democratic members of Congress supports the two transgender athlete plaintiffs and urges the Court to allow sports eligibility based on gender identity; see the Congressional amici brief (Democrats).

Other amici support the states: for example, 27 state attorneys general filed supporting briefs and another includes coaches and Olympians who argue sex-based rules preserve fair competition. Civil‑rights organizations such as the ACLU argue laws like Idaho’s discriminate against transgender students and violate equal-protection and federal sex-discrimination protections.

Safety and contest examples cited by supporters

Supporters point to incidents included in court records and media reports. In the West Virginia case, some parents and athletes alleged harassment and intimidation by a transgender teammate in locker rooms and competition settings. Those claims appear in filings by groups such as Alliance Defending Freedom and have been cited by advocates as reasons to uphold sex-based eligibility laws.

What a Supreme Court decision could mean for the country

Economic impact: A ruling upholding Idaho and West Virginia bans could change funding priorities, scholarship allocations and tournament structures; schools and associations may face legal and administrative costs as they rewrite eligibility rules. A ruling favoring gender-identity inclusion could likewise require statutory and policy changes, with budgetary effects for compliance and enforcement.

Political consequences: The cases have split lawmakers along party lines and could deepen divisions. A ruling either way could become a rallying point in state and federal campaigns, particularly in conservative and rural districts where school sports and Title IX protections are politically salient.

Social and cultural effects: High school and college sports are central to many communities. A decision allowing states to limit girls’ sports to biological females may reassure families seeking stable rules; a decision favoring inclusion may prompt communities to reexamine team management, locker-room policies and local safety practices. Both outcomes could increase local tensions and mobilize parents, coaches and school boards.

Practical steps: Schools should review policies, train staff and communicate with families. Athletic associations may issue guidance while the Court’s decision is pending. Coaches and athletic directors in states with existing laws may seek legal advice if the Court rules against those statutes.

Sources and further reading

The Supreme Court will hear oral arguments Tuesday in the pair of cases that could determine whether biological sex or gender identity governs eligibility for girls’ and women’s sports at public schools and colleges across the country.

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