National Institutes of Health Director Dr. Jay Bhattacharya speaks 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 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 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)

FILE - Emily Danenhower, 17, loads her container as grandparents Rena Ruben and Walter McClain help move her into college as students moved into their dorms during move-in-day at Temple University in Philadelphia, on Monday, Aug. 21, 2023. (Alejandro A. Alvarez/The Philadelphia Inquirer via AP, File)

Russian President Vladimir Putin speaks during a meeting at the Siberian Ring Source of Photons synchrotron radiation facility designed for multidisciplinary research in Koltsovo near Novosibirsk, Russia, Tuesday, Aug. 11, 2026. (Gavriil Grigorov, Sputnik, Kremlin Pool Photo via AP)

FILE - Ukraine's President Volodymyr Zelenskyy looks on during his meeting with U.S. President Donald Trump on the sidelines of the NATO summit in Ankara, Turkey, on July 8, 2026. (AP Photo/Alex Brandon, File)