Mr. Kennedy, the scion of a Democratic dynasty and a prominent vaccine skeptic, faces questions from lawmakers as he seeks a job with vast authority over the lives of Americans.

Caroline Kennedy said in a scathing letter about her cousin, Robert F. Kennedy Jr., that she felt "an obligation to speak out."

Like Trump, Kennedy for years has wielded a firehose of falsehoods across multiple fronts and has engaged in assorted misconduct and odd behavior, so much so that the individual lies and misdeeds zip by and blur into a mess that becomes tough for the media to thoroughly depict and hard for the public to absorb.

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

Caroline Kennedy, daughter of former President John F. Kennedy, warned senators of her “predator” cousin ahead of his first confirmation hearing on Wednesday. In a letter first reported by The Washington Post, she wrote that his victims included family members and parents of sick children.

Robert F. Kennedy Jr. will face the Senate for two days of confirmation hearings in a bid become the leader of Health and Human Services.

In a letter to senators, Caroline Kennedy etches a damning sketch of her cousin, the latest condemnation Robert F. Kennedy Jr. has received from members of his family.