Single-sex K-12 school sports will be made unaffordable under a draft regulation released Thursday by President Joe Biden’s pro-transgender deputies. The draft regulation released by the Department of Education allows schools to keep fair, single-sex sports– but only if the schools collect funds to pay lawyers and expert witnesses every time they exclude an opposite-sex “transgender” youth from a single-sex team. Republicans have already announced their opposition to the regulation, which describes single-sex sports as discriminatory against youths who insist they have become members of the opposite sex: The draft regulation is not in force yet. Once finalized, it can...