Trump arrived Friday in Texas as questions swirl about authorities' response to flash floods that left at least 120 people dead, including dozens of children.

The Homeland Security chief denied that a memo she issued in June requiring her to approve FEMA expenditures over $100,000 caused the agency to move more slowly.

As monstrous floodwaters surged across central Texas late last week, officials at the Federal Emergency Management Agency leapt into action, preparing to deploy critical search and rescue teams and life-saving resources,