NEW YORK  — President-elect Donald Trump is expected to nominate anti-vaccine activist Robert F. Kennedy Jr to lead the Department of Health and Human Services, putting him in charge of a massive agency that oversees everything from drug, vaccine and food safety to medical research and the social safety net programs Medicare and Medicaid.

The expected appointment, which was confirmed by two people familiar with their discussions who spoke on condition of anonymity, has not been officially announced by Trump or his transition team, meaning there is always a chance Trump could change his mind.

Kennedy, a former Democrat who ran as an independent in this year’s presidential race, abandoned his bid after striking a deal to give Trump his endorsement with a promise to have a role in health policy in the administration.

He and Trump have since become good friends, with Kennedy frequently receiving loud applause at Trump’s rallies.

The expected appointment was first reported by Politico Thursday.

A longtime vaccine skeptic, Kennedy is an attorney who has built a loyal following over several decades of people who admire his lawsuits against major pesticide and pharmaceutical companies. He has pushed for tighter regulations around the ingredients in foods.

With the Trump campaign, he worked to shore up support among young mothers in particular, with his message of making food healthier in the U.S., promising to model regulations imposed in Europe. In a nod to Trump’s original campaign slogan, he named the effort “Make America Healthy Again.”

It remains unclear how that will square with Trump’s history of deregulation of big industries, including food. Trump pushed for fewer inspections of the meat industry, for example.

Kennedy’s stance on vaccines has also made him a controversial figure among Democrats and some Republicans, raising question about his ability to get confirmed, even in a GOP-controlled Senate. Kennedy has espoused misinformation around the safety of vaccines, including pushing a totally discredited theory that childhood vaccines cause autism.

He also has said he would recommend removing fluoride from drinking water. The addition of the material has been cited as leading to improved dental health.

HHS has more than 80,000 employees across the country. It houses the Food and Drug Administration, the Centers for Disease Control and Prevention, the Medicare and Medicaid programs and the National Institutes of Health.

Kennedy’s anti-vaccine nonprofit group, Children’s Health Defense, currently has a lawsuit pending against a number of news organizations, among them The Associated Press, accusing them of violating antitrust laws by taking action to identify misinformation, including about COVID-19 and COVID-19 vaccines. Kennedy took leave from the group when he announced his run for president but is listed as one of its attorneys in the lawsuit.