FILE - Dean Malcom drinks water while wiring street lights in extremely hot weather July 14, 2026, in Detroit. (AP Photo/Paul Sancya, File)

FILE - Simone Mosley waits for their ride in shade at a bus stop during an extreme heat warning July 13, 2026, in Minneapolis. (AP Photo/Ellen Schmidt, File)

FILE - Daniel Aragonez leaves a cooling center in Los Angeles, July 31, 2026. (AP Photo/Jae C. Hong, File)

FILE - Ruth, 11, from Burke, Va., gets cold water poured on her head to cool off at the Great American State Fair on the National Mall, July 2, 2026, in Washington. (AP Photo/Alex Brandon, File)

FILE - Mickelina Papotto, of Salem, Ore., left, and Lorie Odegaard, of Gaithersburg, Md., fan themselves while waiting in line for the ferris wheel at the Great American State Fair on the National Mall, July 1, 2026, in Washington. (AP Photo/Jacquelyn Martin, File)

FILE - A sign for the U.S. Food and Drug Administration is displayed outside their offices in Silver Spring, Md., Dec. 10, 2020. (AP Photo/Manuel Balce Ceneta, File)

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)