Robert F. Kennedy Jr.’s nomination to be the nation’s top health official is uncertain after a key Republican joined Democrats to raise persistent concerns over the nominee’s deep skepticism of routine childhood vaccinations that prevent deadly diseases.

The most powerful moment in two days of confirmation hearings for Robert F. Kennedy Jr., whom President Donald Trump nominated to head Health and Human Services, came from Louisiana Republican Sen. Bill Cassidy. A physician, Cassidy told Kennedy of an 18-year-old patient with hepatitis B who suffered from liver failure and needed a transplant.

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.

Robert F. Kennedy Jr., a former presidential candidate and environmental activist, endorsed Donald Trump last year and threw his weight behind a campaign to “Make America Healthy Again.” For the past two decades he has been best known for airing skeptical views on vaccines.

Robert F. Kennedy Jr., Donald Trump’s nominee to run the Department of Health and Human Services, once pitched the idea to run an experiment on the children of Samoa to see whether vaccines actually work.

Thursday marks another day of Senate confirmation hearings for Robert F. Kennedy Jr., Kash Patel and Tulsi Gabbard.

PolitiFact is live fact-checking the confirmation hearings for Robert F. Kennedy Jr. and Kash Patel, two of President Donald Trump's Cabinet picks.

During the confirmation hearing form Robert F. Kennedy Jr. In the Senate today, Senator Mark Warner went ballistic on Kennedy over his record.

President Donald Trump’s most controversial Cabinet nominees have flooded the zone Thursday in back-to-back-to-back confirmation hearings.

In the first of two days of hearings, Robert F. Kennedy Jr. said he wasn’t antivaccine as senators pressed on his past remarks. Tulsi Gabbard and Kash Patel have hearings today, and RFK Jr. faces another panel.