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I suspect that none of the parents who volunteered for Jonas Salk’s polio vaccine trial were hoping their children were in the placebo group.

That was the nationwide trial of Jonas Salk’s polio vaccine.

McConnell had warned Kennedy not to undermine the polio vaccine.

In the podcast interview, Kennedy went on to outline what he called safety problems with several common vaccines, including the polio vaccine, and later called vaccines "inherently unsafe", apparently quoting former President Ronald Reagan.

An advisor to Donald Trump’s pick for Health and Human Services, Robert F. Kennedy Jr., petitioned the government to withdraw approval of the polio vaccine.