The NCAA, the governing body for US collegiate sports, has issued a new policy that limits competition in women's sports to only student-athletes assigned female at birth. Announced on Thursday, the National Collegiate Athletic Association said its policy applied to all athletes and was effective immediately.

Of the more than 500,000 NCAA student athletes, fewer than 10 of them are trans, according to NCAA President Charlie Baker.

The new policy, which is effective immediately, limits competition in women’s sports exclusively to athletes assigned female at birth.