The health and human services secretary nominee addresses everything from vaccines to stem cell research at his Senate confirmation hearing.

More dramatic questioning on vaccines in RFK Jr's second confirmation hearing. Bond/Simmons-Duffin/Stone/Webber

In a scathing letter Tuesday, Caroline Kennedy warned senators about her cousin, Robert F. Kennedy Jr., calling him a "predator."

Robert F. Kennedy Jr. faced aggressive questions about his skepticism of vaccines and other issues during the first of two scheduled Senate confirmation hearings.

RFK Jr. claimed he is not “anti-vaccine” and appeared unfamiliar with key aspects of healthcare insurance programs in his confirmation hearing.

Robert F. Kennedy Jr. faced intense scrutiny Wednesday on Capitol Hill as he sought confirmation for the role of Health and Human Services secretary.

RFK Jr.'s confirmation hearings continue today as he appears before a second Senate committee. Follow STAT's live updates.

If confirmed by the Senate, Kennedy would head the Department of Health and Human Services (HHS), which oversees many of the country’s health agencies, from the Food and Drug Administration (FDA) to the Centers for Disease Control and Prevention (CDC).

RFK Jr.'s second Senate confirmation hearing focused on vaccines, Medicare, diversity, and science. Key Republicans were reticent to show support.

The nominee for secretary of Health and Human Services wants to disrupt America’s health care system and ask questions the establishment won’t.

The 19th spoke to medical experts about what Kennedy can and can’t do around vaccines if confirmed to lead the Department of Health and Human Services.