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.

Kennedy, a harsh and persistent critic of childhood vaccination, led the nation’s top antivaccine organization for years.

Patrick Kennedy suggests Robert F. Kennedy Jr. would be open to use of addiction medications as well as "wellness farms" for opioid use disorder.

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

Kennedy Jr., President Trump's pick for health secretary, has falsely linked vaccines to autism and argued people should have separate vaccination schedules based on their race.

If confirmed by the Senate, Kennedy would head the Department of Health and Human Services (HHS), which oversees many of the country’s health agencies, from the Food and Drug Administration (FDA) to the Centers for Disease Control and Prevention (CDC).

In a harsh letter to lawmakers considering Robert F. Kennedy Jr.’s nomination for health secretary, Ms. Kennedy called her cousin unfit for the job and a “predator” who led family members to addiction.

Caroline Kennedy wrote a letter to the Senate Committee on Health, Education, Labor and Pensions strongly discouraging them from confirming her cousin Robert F. Kennedy Jr. as U.S. Department of Health and Human Services secretary.

Caroline Kennedy on Tuesday warned that her cousin Robert F. Kennedy Jr. is a “predator” ahead of his high-profile confirmation hearings this week to be President Donald Trump’s Department of Health and Human Services secretary,

Kennedy is the country's most well-known anti-vaccine activist, and could soon lead be Trump's top health official.

Robert F. Kennedy Jr. has built his fortune and reputation on disparaging the government scientists and institutions he's now in line to lead as HHS secretary.