Caroline Kennedy – a former U.S. ambassador to both Australia and Japan and the last living child of former President John F. Kennedy, Robert F. Kennedy Jr.'s uncle – called the role "an enormous responsibility, and one that Bobby is unqualified to fill."

Caroline Kennedy has unleashed on her cousin Robert F. Kennedy Jr. in a bid to prevent him taking charge of America’s health system, accusing him of being a “predator” who turned their relatives into drug addicts.

In a letter to Senators, Ms. Kennedy, who previously served as a U.S. ambassador to Australia and Japan and is the daughter of former President John F. Kennedy, etched a damning sketch of the her cousin, the latest condemnation Robert F. Kennedy Jr. has received from members of his own, prominent Democratic family.