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.

RFK Jr. claimed he is not “anti-vaccine” and appeared unfamiliar with key aspects of healthcare insurance programs in his confirmation hearing.

WASHINGTON D.C., DC — Georgia Sen. Raphael Warnock and Robert F. Kennedy Jr. had a tense exchange during his confirmation hearing Wednesday to examine the RFK Jr.'s qualifications to be the country's top health official.

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).

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.

Robert F. Kennedy Jr. was confronted with a number of his baseless claims and a vexing abortion issue. But Republican senators treaded lightly.

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.