Twenty-one states have banned transgender females from participating in girls and women's sports, and Robert F. Kennedy Jr. wants that number to rise.
The son of the former New York senator appeared on CNN Saturday morning and said he opposes biological males participating in female sports.
"I am against people participating in women's sports who are biologically male," the Democratic presidential candidate said. "I think women have worked too hard to develop women's sports over the past 30 years. I watched it happen, and I don't think that's fair."