Caitlyn Jenner has a take on trans athletes you might not expect -- namely, if you're born as a biological boy, you shouldn't be allowed to compete in girls' sports ... at least while you're still in school, anyway.
We got the California gubernatorial hopeful Saturday in Malibu, and she weighed in on her first big political issue as she takes center stage in her run for Gavin Newsom's job -- telling TMZ she doesn't support trans girls born as boys participating in all-female school sports.
Yeah, we know .