Robert F. Kennedy Jr., President-elect Donald Trump's nominee to be Secretary of Health and Human Services, walks to meet with Sen. John Thune, R-S.D. at the Capitol in Washington, Tuesday, Dec. 17, 2024. (AP Photo/Jose Luis Magana)

Robert F. Kennedy Jr., President-elect Donald Trump's nominee to be Secretary of Health and Human Services, center, walks to meet with Sen. John Thune, R-S.D. at the Capitol in Washington, Tuesday, Dec. 17, 2024. (AP Photo/Jose Luis Magana)

Robert F. Kennedy Jr., President-elect Donald Trump's nominee to be Secretary of Health and Human Services, waves to the media as he rides the train to go to meet with Sen. John Thune, R-S.D. at the Capitol in Washington, Tuesday, Dec. 17, 2024. (AP Photo/Jose Luis Magana)

Robert Kennedy Jr., second from right, President-elect Donald Trump's pick to lead the Health and Human Services Department, rides the Capitol subway as he travels between meetings with senators on Capitol Hill, Tuesday, Dec. 17, 2024, in Washington. (AP Photo/Mark Schiefelbein)

Robert Kennedy Jr., right, President-elect Donald Trump's pick to lead the Health and Human Services Department, meets with Sen. Tommy Tuberville, R-Ala., on Capitol Hill, Tuesday, Dec. 17, 2024, in Washington. (AP Photo/Mark Schiefelbein)

Robert Kennedy Jr., President-elect Donald Trump's pick to lead the Health and Human Services Department, walks between meetings with senators on Capitol Hill, Tuesday, Dec. 17, 2024, in Washington. (AP Photo/Mark Schiefelbein)

Robert F. Kennedy Jr., President-elect Donald Trump's nominee to be Secretary of Health and Human Services, waves to the media as he rides the train to go to meet with Sen. John Thune, R-S.D. at the Capitol in Washington, Tuesday, Dec. 17, 2024. (AP Photo/Jose Luis Magana)

Robert Kennedy Jr., President-elect Donald Trump's pick to lead the Health and Human Services Department, meets with Sen. Tommy Tuberville, R-Ala., on Capitol Hill, Tuesday, Dec. 17, 2024, in Washington. (AP Photo/Mark Schiefelbein)

FILE - Republican presidential nominee former President Donald Trump greets Robert F. Kennedy Jr., at a Turning Point Action campaign rally, Oct. 23, 2024, in Duluth, Ga. (AP Photo/Alex Brandon)

Robert F. Kennedy Jr., President-elect Donald Trump's nominee to be Secretary of Health and Human Services, walks to meet with Sen. Roger Marshall, R-Kan., at the Capitol in Washington, Tuesday, Dec. 17, 2024. (AP Photo/Jose Luis Magana)