Robert F. Kennedy Jr.'s record of questioning childhood vaccine safety came under fire from a key Republican at the Trump HHS pick's confirmation hearing.

If approved, Kennedy will control a $1.7 trillion agency that oversees food and hospital inspections, hundreds of health clinics, vaccine recommendations and health insurance for roughly half the country.

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).

RFK Jr. had his confirmation hearing with the Senate Committee on his role as Department of Health and Human Services secretary. Find out more here.

Kennedy Jr. "go wild" on health, food and medicine as head of the Department of Health and Human Services. He now faces two separate confirmation grillings over his controversial views -- on everything from vaccines to abortion -- that have both Republicans and Democrats raising concerns.

As Robert F. Kennedy Jr. faced skeptical senators Thursday in the second day of his confirmation hearing to lead the department of Health and Human Services, Sen. Bill Cassidy confronted Kennedy about vaccines.