Mr. Trump said his administration was working with state and local officials and that Department of Homeland Security Secretary Kristi Noem would be arriving in Texas shortly. DHS oversees the Federal Emergency Management Agency.

At least 81 people, including more than two dozen children, died in the torrential downpour. Dozens more were still missing three days later.

Fort Worth and all of Texas stands ready to continue to lend support in any way possible,” Mayor Mattie Parker said.