Aaron Siri, who specializes in vaccine lawsuits, has been at Robert F. Kennedy Jr.’s side reviewing candidates for top jobs at the Department of Health and Human Services.

Attorney Aaron Siri is an ally of HHS secretary nominee Robert F. Kennedy Jr. He asked the FDA to withdraw or suspend the polio vaccine.

President-elect Donald Trump has praised the polio vaccine as the “greatest thing,” but a lawyer affiliated with Trump’s pick to lead the country’s top heath agency has petitioned the US Food and Drug Administration to revoke approval of the vaccine used in the United States.