Three of President Donald Trump’s most controversial Cabinet nominees faced sharp questions in the Senate during hearings Thursday from Democrats as well as several Republican senators in what amounted to the most direct skepticism from GOP senators over Trump’s nominees to date.

Robert F. Kennedy Jr. was pressed to clarify his views on vaccines, abortion, and public health priorities in his first Senate 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.