The exchanges show how RFK Jr. has failed to update his views on important health issues, even when presented with new science.

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.

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

Kennedy has downplayed his history of advocating against vaccines since he was nominated to lead the Department of Health and Human Services.

Robert F. Kennedy Jr.'s anti-vaccine advocacy is outside the mainstream. His previous statements on abortion could alienate Republicans. But a new poll finds that not all of his controversial health goals are unpopular — in fact,

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

Over many years, Kennedy has been clear about his beliefs on vaccines in dozens of interviews, podcasts and social media posts.

Robert F. Kennedy Jr., nominee for the U.S. Department of Health and Human Services, faces scrutiny for his past vaccine stance and other controversial remarks. During Senate hearings, both proponents and opponents highlighted Kennedy's history of vaccine misinformation.

Kyra Kennedy, 29, is the youngest daughter of health secretary nominee Robert F. Kennedy Jr.

Sen. Bill Cassidy, the top Republican on the Senate Committee on Health, Education, Labor and Pensions, concluded Thursday's hearing by saying he was "struggling" with the nomination due to Kennedy's vaccine positions. Kennedy notably refused to say vaccines don't cause autism as he faced pointed question from lawmakers.

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

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