Monica Medina, who worked in the State Department under President Biden, scolded President Trump on climate change after the deadly Texas floods, calling it an existential threat.

Historic rainfall fell last week in Central Texas, with the Guadalupe River rising 25 feet in 45 minutes around 4:30 a.m. on Friday, July 4. At least 84 of the confirmed fatalities are in Kerr County, Texas, including at least 27 at Camp Mystic, a summer camp along the river. Last week, Mr. Trump signed a disaster declaration for the region.