Caitlyn Jenner thinks transgender athletes who were born male should not be allowed to compete in girls' sports teams.
The former Olympian - who came out as transgender in 2015 - recently announced she was running to become the next governor of California, and has now revealed her views on transgender athletes.
Jenner, 71, told TMZ: "This is a question of fairness. That's why I oppose biological boys who are trans competing in girls' sports in school. It just isn't fair, and we have to protect girls' sports in our schools."
During the impromptu interview, Jenner - who won gold at the 1976 Olympics in Montreal - was subsequently asked whether a ban would be "de-legitimising" to a trans person's identity.