President-elect Trump has tapped anti-vaccine activist and environmental lawyer Robert F. Kennedy Jr. to head the Department of Health and Human Services (HHS). HHS has a budget of nearly $2 trillion and administers federal health programs including Medicare, Medicaid and the Affordable Care Act. HHS and its subagencies are responsible for responding to diseases and public health threats like COVID-19 and bird flu, as well as approving new drugs, including vaccines. HHS oversees 13 separate agencies, and Kennedy has long argued they are all in desperate need of reform.