Senators Kelly Loeffler (R-GA), Mike Lee (R-UT), Marsha Blackburn (R-TN), James Lankford (R-OK), and Tom Cotton (R-AR) recently introduced a bill that will protect female athletes of all ages from being forced to complete against biological men. The issue has galvanized an unlikely coalition of women, from feminists to pro-family, pro-life advocates, who have teamed up with female athletes fighting against the transgender movement that believes “gender identity” and not biological sex should be the standard for competition in sports. The bill also is tied to Title IX, the federal statute that prevents discrimination against women in sports because of...