President Donald Trump listens during a meeting to sign an executive order about vaccines, Monday, Aug. 10, 2026, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)

Health and Human Services Secretary Robert F. Kennedy Jr. speaks as President Donald Trump listens during a meeting to sign an executive order about vaccines, Monday, Aug. 10, 2026, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)

President Donald Trump holds up an image taken from his Truth Social account as Health and Human Services Secretary Robert F. Kennedy Jr. watches during a meeting to sign an executive order about vaccines, Monday, Aug. 10, 2026, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)

President Donald Trump talks to service members as he switches planes at U.S. Air Force Base, RAF Mildenhall in Suffolk Eastern England, on his way back to Washington from the NATO summit in Ankara, Turkey, Wednesday, July 8, 2026. (AP Photo/Alex Brandon)

Catering trucks are parked at Air Force One on the tarmac as the motorcade carrying U.S. President Donald Trump arrives on the tarmac to depart following the NATO summit at Ankara International Airport in Ankara, Turkey, Wednesday, July 8, 2026. (AP Photo/Alex Brandon)

FILE - A catering truck is parked at Air Force One on the tarmac as the motorcade carrying U.S. President Donald Trump arrives to depart following the NATO summit at Ankara International Airport in Ankara, Turkey, Wednesday, July 8, 2026. (AP Photo/Alex Brandon)

As Defense Secretary Pete Hegseth watches at left, President Donald Trump gestures as he switches planes at U.S. Air Force Base, RAF Mildenhall in Suffolk Eastern England, on his way back to Washington from the NATO summit in Ankara, Turkey, Wednesday, July 8, 2026. (AP Photo/Alex Brandon)

Catering trucks are parked at Air Force One on the tarmac as the motorcade carrying U.S. President Donald Trump arrives on the tarmac to depart following the NATO summit at Ankara International Airport in Ankara, Turkey, Wednesday, July 8, 2026. (AP Photo/Alex Brandon)