Asked by NBC News’s Dasha Burns on Sunday whether he would be “on board” with such a proposal, Trump said, “Well, I haven’t talked to him about it yet, but it sounds OK to me. You know it’s possible.”

Kennedy said in a post on X on Saturday that “Fluoride is an industrial waste associated with arthritis, bone fractures, bone cancer, IQ loss, neurodevelopmental disorders, and thyroid disease.”

In a follow-up post, he cited an article from the Guardian that discussed a court’s ruling in early October of this year that fluoride levels in U.S. water pose a risk to the public, including potential developmental damage and lower IQ in children. The ruling was handed down by a judge appointed by former President Barack Obama, Edward Chen.

The ruling will now require the Environmental Protection Agency to strengthen fluoride regulations.

The Centers for Disease Control and Prevention says that fluoride in water helps prevent cavities, and that “Protecting teeth requires consistent, low levels of fluoride in the mouth.”

Kennedy’s proposal comes as speculation continues about his role in a potential second Trump administration. He has used his slogan, “Make America Healthy Again,” on the campaign trail for Trump. Trump also said at his Madison Square Garden rally that he would let Kennedy “go wild on health. I’m going to let him go wild on the food. I’m going to let him go wild on the medicines.”

Kennedy claimed last week that Trump would give him “control” over the Department of Health and Human Services and the Department of Agriculture, something the Trump campaign later denied.