People seek relief from the heat along the Seine River in Paris, Monday, May 25, 2026. Artwork by street artist JR is seen on the Pont Neuf in the background. (AP Photo/Michel Euler)

A man drinks water at a fountain in downtown Rome as temperatures are expected to reach 32 degrees Celsius (89.6 Fahrenheit), Tuesday, May 26, 2026. (AP Photo/Gregorio Borgia)

A man drinks outside the Palace of Westminster in London, Tuesday, May 26, 2026. (AP Photo/Kin Cheung)

Swimmers keep cool in the hot weather in an open-air pool in Letchworth Garden City, Hertfordshire, England, Tuesday May 26, 2026. (Joe Giddens/PA via AP)

A view of the beach as people enjoy the hot weather in Brighton, East Sussex, England, Tuesday May 26, 2026. (Gareth Fuller/PA via AP)

Mike Neal, right, 45, a canvasser for Dallas county clerk candidate Damarcus Offord, Jermaca Brown, center, 32, deputy campaign manager for Rep. Julie Johnson, D-Texas, and Sam Dalton, left, 31, a volunteer with Stonewall Democrats, stand outside the Oak Lawn Branch Library during local and primary runoff elections Tuesday, May 26, 2026, in Dallas. (AP Photo/Gabriela Passos)

Sen. John Cornyn, R-Texas, center right, speaks during a primary runoff election night event after losing the Republican party's nomination Tuesday, May 26, 2026, in Austin. (AP Photo/Ashley Landis)

FILE - Former President Joe Biden speaks to the South Carolina Democratic Party, Feb. 27, 2026, in Columbia, S.C. (AP Photo/Matt Kelley, File)