Aaron Siri, the attorney for Robert F. Kennedy Jr. — President-elect Donald Trump’s presumptive nominee for secretary of Health and Human Services — filed a request Friday with the federal government to revoke approval of the polio vaccine.

Siri, a prominent conspiracy theorist like Kennedy, has already filed a petition to suspend distribution of 13 other vaccines, including those that protect against hepatitis B and COVID-19. Its most recent submission was to the Food and Drug Administration (FDA). Like Kennedy, Siri is critical of vaccines, and through the Informed Consent Action Network, a nonprofit organization both men are affiliated with, both have repeatedly made false claims that vaccines are dangerous or cause autism.

“I love Aaron Siri,” Kennedy said in a clip played on a recent episode of a podcast hosted by Informed Consent Action Network founder Del Bigtree. “There is no one who has been a greater asset to the medical freedom movement than he.”

The war on polio vaccines, in particular, has already taken a human toll. In 2022, a team of federal scientists from the Centers for Disease Control and Prevention investigated a series of polio cases in Rockland County, NY, where an epidemic struck a large Hasidic Jewish community where anti-vaccination conspiracy theories are particularly popular.

Dr. Jonas Salk developed the polio vaccine in 1955 with international success and announced that he would make it available free of charge. Speaking to Salon last year, Dr. Peter Salk said his father was “really confused” about the emergence and spread of anti-vaccine ideology. “His entire commitment was to protecting the population from infectious diseases,” said Salk.