Donald Trump has picked vaccine sceptic and former independent presidential candidate Robert F Kennedy Jr as his health secretary, as the president-elect continues to build his new administration.
Kennedy, commonly known by his initials RFK Jr, has a history of spreading health information that scientists say is false.
If his nomination is ratified by the Senate, he will lead a huge agency overseeing everything from food safety to medical research and welfare programmes.
The executive director of the American Public Health Association (APHA) said the organisation will "absolutely oppose" Kennedy's nomination.