Republican Sen. Bill Cassidy, R-La., told Robert F. Kennedy Jr. on Thursday that he has been "struggling with your nomination" to lead the U.S. Department of Health and Human Services. Cassidy's comments came during the second hearing this week for Kennedy, President Donald… pic.twitter.com/zlLMfc2D0g

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.

Robert F. Kennedy’s first confirmation hearing Wednesday to become secretary of the Department of Health and Human Services was quickly interrupted by protesters over the Trump nominee’s vaccine positions. During his opening remarks, Kennedy said under oath that he is “not anti-vaccine”—but people standing in the back of the room weren’t convinced.

Robert F. Kennedy Jr. said he wasn’t antivaccine as senators pressed on his past remarks, in the first of two days of hearings over his nomination for health secretary.

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.

A trio of high-profile hearings took center stage Thursday on Capitol Hill, with senators scrutinizing President Donald Trump’s most contentious remaining nominees. Director of national intelligence pick Tulsi Gabbard and FBI director selection Kash Patel testified for the first time,

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.

Tulsi Gabbard, Kash Patel and Robert F. Kennedy Jr. are among Trump's more controversial nominees, and faced tough questions from senators Thursday.

As the U.S. Senate confirmation hearings continue for President Donald Trump’s Cabinet picks, PolitiFact is live fact-checking the hearings for FBI

Robert F. Kennedy Jr. wasn't the only one of President Donald Trump's Cabinet picks to face tough questions on Capitol Hill Thursday.

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

During confirmation hearings, Robert F. Kennedy Jr., Kash Patel and Tulsi Gabbard faced tough senate scrutiny on their controversial pasts.