The Idaho Senate passed a bill on Monday to prohibit biological males who identify as female from competing in girls' and women's sports, with an amendment that must now be approved by the Idaho House of Representatives.
Known as the Fairness in Women's Sports Act, the bill passed the Senate 24-11. Idaho's House of Representatives passed the original bill in February.
Critics of the bill say it discriminates against transgender athletes. The bill's sponsor, Rep. Barbara Ehardt, says it is only meant to protect women and girls.
"The simple fact is, boys have physical advantages over girls," Ehardt wrote in a February opinion piece published by the Idaho Press. "Those advantages mean, if boys competed against girls, our young women would become spectators in their own sports. That would take us back to the days of my youth when girls just didn't play many sports."