Comment by fringol

They are male, and retain male physiological advantage even if they undergo interventions like testosterone suppression. It's not the only route by which a male athlete with such advantage might compete in women's sport, nor is it an issue limited to the USA. This is a broader issue affecting the fairness of women's sport in competitions across the world.

For instance, all three medallists in the women's 800m at the 2016 Rio Olympics were male. They had been issued with female birth certificates by their home countries due to having underdeveloped external male genitalia - and therefore according to the rules at the time could enter as female - but they still benefited from testosterone-driven development.

World Athletics, and other sports governing bodies for other sports, have tightened their eligibility criteria in response to cases like this, and in light of evidence that male advantage is still retained even with pharmaceutical or surgical treatments. This has been an ongoing problem for much longer than US pundits have been bringing it up in relation to trans, and it's adversely affected many female athletes, from amateur leagues to international competition.