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)

A health worker in protective gear walks at an Ebola treatment centre in Bunia, Congo, Monday, Aug. 10, 2026. (AP Photo/Dieudonne Dirole)

A health worker in protective gear looks on at an Ebola treatment centre in Bunia, Congo, Monday, Aug. 10, 2026. (AP Photo/Dieudonne Dirole)

A health worker in protective gear prepares to mop the floor at an ebola treatment centre in Bunia, Congo, Monday, Aug. 10, 2026. (AP Photo/Dieudonne Dirole)

Health workers in protective gear wave inside an Ebola treatment centre in Bunia, Congo, Monday, Aug. 10, 2026. (AP Photo/Dieudonne Dirole)

The Zollburg Pfalzgrafenstein toll castle is seen in the middle of the Rhine river with low water levels, in Kaub, Germany, Monday, Aug. 10, 2026. (AP Photo/Michael Probst)