In short:
The US Olympic and Paralympic Committee has changed its policy on its website to effectively ban transgender athletes.
The organisation said it was obliged to follow an executive order issued by President Donald Trump in February.
What’s next?
The US is hosting the next summer Olympics in 2028 in Los Angeles.
[Ed: This headline is misleading as no one has been barred from competing – just required to compete in the appropriate sex category.]

ABC News getting it wrong, yet again.
In reality, anyone who declares himself or herself to be ‘transgender’ will ONLY be allowed to compete in the category of their Biological Sex.
No males will be allowed to demand entry to female sports any more, thereby ‘cheating’ female athletes of their rightful opportunities