A key legal adviser to Robert Kennedy Jr, Donald Trump’s pick for health secretary, is at the center of efforts to push federal drug regulators to revoke approval for the polio and hepatitis B vaccines and block distribution of 13 other critical vaccines.

Aaron Siri, a lawyer who has been helping Kennedy select top health administrators as part of the Trump transition process, is deeply embedded in longstanding efforts to force the US Food and Drug Administration (FDA) to withdraw a raft of vaccines that have saved the lives and health of millions of Americans.

Siri has been sitting alongside Kennedy in interviews in which they have asked candidates for top health jobs where they stand on vaccines, the New York Times reported on Friday.

Kennedy, a leading vaccine sceptic, has insisted he has no plans to revoke vaccines should he be confirmed by the US Senate for the health secretary position. But his close ties with Siri are raising concerns about the incoming Trump administration’s intentions, given the lawyer’s intimate involvement in the anti-vaccine movement.

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Siri works closely with the Informed Consent Action Network (Ican), a “medical freedom” non-profit founded by Del Bigtree, whose has long waged war on vaccines including as producer of the anti-vaccination documentary, Vaxxed. The New York Times report noted that Siri filed the 2022 petition calling for the FDA to revoke approval for the polio vaccine on behalf of ICAN.

Poliovirus, the cause of a disease that used to be one of the most feared by Americans, has been eliminated from the country by the US through polio vaccines. The federal Centers for Disease Control and Prevention notes%20in%20the%20population.) that the best way to avoid its return and keep people safe is through vaccination.

Siri has not only been involved in lawsuits calling for the withdrawal or suspension of the polio and hepatitis B vaccines, but he has also petitioned the FDA to “pause distribution” of 13 other vaccines, according to the Times.

Trump said this week that Kennedy may investigate vaccines for a supposed link with autism. The remark to NBC suggests that his pick for health secretary may run with the conspiracy theory that there is a connection between childhood vaccinations and autism that has been thoroughly debunked yet is repeatedly peddled by Kennedy.

Kennedy’s spokesperson, Katie Miller, confirmed to the Times that Siri has been advising Kennedy but said his vaccine petitions had not been discussed.

“Mr Kennedy has long said that he wants transparency in vaccines and to give people choice,” she said.