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.

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's nomination will put Republican lawmakers' loyalty to the test, as the former Democrat holds a range of unorthodox positions that could alienate both conservatives and liberals.

As Robert F. Kennedy Jr. faced skeptical senators Thursday in the second day of his confirmation hearing to lead the department of Health and Human Services, Sen. Bill Cassidy confronted Kennedy about vaccines.

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

The questioning comes after Robert F. Kennedy Jr. faced grueling testimony on Thursday to secure the Secretary of Health and Human Services position

Vaccination bills are popping up in more than 15 states as lawmakers aim to potentially resurrect or create new religious exemptions from immunization mandates, establish state-level vaccine injury databases or dictate what providers must tell patients about the shots.

Robert F. Kennedy Jr. transferred ownership of the trademark application in December and its abbreviation — MAHA — to an LLC managed by Del Bigtree.

WASHINGTON (AP) — 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, at least one has broad support among Democrats and Republicans.

Robert F. Kennedy Jr., President Donald Trump's pick to lead the top U.S. health agency, appeared before the Senate Finance Committee for his confirmation hearing on Wednesday, where he is expected to face a grilling over his views on vaccines and abortion.

The Texas legislature is debating bills that advocates say could give individuals more choice in whether they vaccinate themselves and their children.

Trump will sign an executive order reinstating active and reserve military personnel, with their former rank, full back pay, and benefits, who were let go by the Biden administration over their vaccination status and ask to be reinstated.