President Donald Trump signs an executive order about vaccines as Jayme Franklin, left, and Health and Human Services Secretary Robert F. Kennedy Jr. watch Monday, Aug. 10, 2026, in the Oval Office of the White House in Washington. (AP Photo/Jacquelyn Martin)

Surrounded by security, President Donald Trump 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)

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)

FILE - Demonstrators protest against President Donald Trump's deployment of federal law enforcement and National Guard troops during a march, Sept. 6, 2025, in Washington. (AP Photo/Jose Luis Magana, File)

FILE - National Guard members gather near a large portrait of President Donald Trump on the Labor Department headquarters before the body of Metropolitan Police Department officer Terry Bennett is driven past the Capitol, Jan. 8, 2026, in Washington. (AP Photo/Mark Schiefelbein, File)

FILE - Armed National Guard soldiers from West Virginia patrol the Mall near the Capitol in Washington, as part of President Donald Trump's order to impose federal law enforcement in the nation's capital, Aug. 26, 2025. (AP Photo/J. Scott Applewhite, File)

President Donald Trump holds a signed executive order about vaccines as Health and Human Services Secretary Robert F. Kennedy Jr. looks on, 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)