WATCH: Human Rights Campaign says there are more than two sexes

"I'm running out of time, are there more than two sexes, in your opinion?" Kennedy asked Human Rights Campaign President Alphonso David.

"It's not limited to two," Alphonso said.

Kennedy addressed author Abigail Shrier, who opposes the act on the grounds that it enshrines gender identity as a protected characteristic and is "misogyny in progressive clothing" that will destroy women's sports and their rights to protected spaces.

"If I'm a parent of a transgender child, and I decline to have my child, a minor, take sex changing hormones, or or chemicals or undergo sex change surgery, how would this bill impact my rights as a parent?" Kennedy asked Shrier.

"I don't know how it necessarily will," Shrier replied, "but it would seem that it would make it harder for parents to make it hard to exercise their own judgement whenever a child says they have gender dysphoria. I think there would be more danger of coming under pressure and losing custody."

He asked attorney Alphonso David, President of the Human Rights Campaign, "How many sexes do you think there are?"

"How many sexes? Well there's a difference between sex and gender identity, if that's what you're getting at," David said.

"No," Kennedy replied, "I'm asking how many biological sexes you think there are."

"Well I would refer to the medical practitioners," he said. "But I think there've been studies showing that if you're talking about sex, sex is defined by many different characteristics, including chromosomes—"

"Are there more than two?" Kennedy asked.

"You could make that argument that there might be more than two

Are you making that argument?

"Well, you, I—Senator, I can't ignore the fact there are individuals who are intersex, and so, um, it's not binary," David said.