Robert F. Kennedy Jr. was sworn in as the nation’s top health official Thursday in the Oval Office, completing an improbable arc for the anti-vaccine activist and one-time Democratic presidential

Robert F. Kennedy Jr. was confirmed as the new head of the US Department of Health and Human Services, launching a new era in US health policy after the one-time presidential hopeful openly questioned the safety of widely used vaccines and promised to remove artificial food dyes from America’s food supply.