WNBA legend Sue Bird says IOC's new policy to protect women's sports is akin to 'fearmongering'

"I think the other part is a reminder. What we have always talked about and focused on is, if you open this door, if you crack this door open, it gets blown open and you're not policing women's bodies across the board. I feel very sad about this. So, to kind of circle back to how we started, just want to send so much love to the trans community."

The organization added that the policy was "evidence-based" and "expert-informed." The testing can be conducted via saliva, cheek swab or blood sample.

A presentation at a World Athletics panel in Tokyo in September revealed that 50 to 60 athletes with male biological advantages have been finalists in the female category at global and continental championships since 2000.

The panel was led by the head of the World Athletics Health and Science Department, Dr. Stéphane Bermon, who said sex tests were necessary because of an "over-representation" of DSD (differences of sex development) athletes among finalists, per multiple reports.

Fox News' Jackson Thompson contributed to this report.