Robert F. Kennedy Jr.’s opinions about vaccine safety, both past and present, appeared likely to lead at least a few Senate Republicans to vote against his nomination following a second confirmation hearing Thursday.

WASHINGTON D.C., DC — Georgia Sen. Raphael Warnock and Robert F. Kennedy Jr. had a tense exchange during his confirmation hearing Wednesday to examine the RFK Jr.'s qualifications to be the country's top health official.

Georgia Sen. Raphael Warnock pressed Robert F. Kennedy Jr. during a Senate Finance Committee to gain insight on how he would lead if confirmed as Health Secretary. Kennedy is President Trump’s nominee to run the Department of Health and Human Services (HHS).

Watch live as RFK Jr. faces questions from senators in his confirmation hearing as President Trump’s nominee to lead the Department of Health and Human Services.

The issue isn’t only his troubling views but whether a complex federal agency can function effectively under his leadership.

Kathleen "Kick" Kennedy is the eldest daughter of Robert F. Kennedy Jr., who could be confirmed as health secretary in Trump's administration.

Robert F. Kennedy Jr.'s long record of questioning the safety of childhood vaccinations persisted as a flash point for him Thursday during a confirmation hearing where a key Republican quickly raised concerns about his views.

Robert F. Kennedy Jr. has said vaccines are not safe. His support for abortion access has made conservatives uncomfortable.

What to know from Robert F. Kennedy, Jr.’s hearings before the Senate Finance Committee on Wednesday and the Senate Health, Education, Labor, and Pensions on Thursday.

If approved, Kennedy will control a $1.7 trillion agency that oversees food and hospital inspections, hundreds of health clinics, vaccine recommendations and health insurance for roughly half the country.

The recent Senate confirmation hearings for Robert F. Kennedy Jr. presented a striking scene that would confuse a time traveler from 10 years ago. Democratic lawmakers took turns excoriating a man who once embodied their ideals. Sen. Bernie Sanders, seemingly grasping for gotchas, was reduced to questioning Kennedy about baby clothing merchandise.

KFF Health News reporters break down the biggest takeaways from Robert F. Kennedy Jr.’s confirmation hearings for secretary of Health and Human Services.