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Protest ribbons are tied to a fence at Lafayette Park, near the White House, Tuesday, Aug. 25, 2026, in Washington. (AP Photo/Alex Brandon)

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FILE - Dr. Jessica Early holds a vial of the combination measles, mumps and rubella vaccine at Prisma Health Pediatrics in Greer, S.C., March 18, 2026. (AP Photo/Mary Conlon, File)