Robert F. Kennedy Jr. is telling senators considering his nomination to lead the government’s health agencies he merely wants transparency about vaccines.

Changing the membership of an obscure advisory committee could have an outsize effect on Americans’ protection against disease.

Robert F. Kennedy Jr. is distancing himself from his anti-vaccine work as he seeks to become the leader of the nation’s top health agency under President Donald Trump, according to government ethics documents released on Wednesday.

When Senate Democrats huddled with prominent public health experts on Wednesday to discuss the benefits of vaccines, it felt like they were preparing for battle. The senators peppered the experts with questions about ideas espoused by vaccine critics,