David Richardson, the acting head of the Federal Emergency Management Agency, resigned Monday after just six months in charge, following mounting criticism over his handling of the devastating July 4 floods in the Texas Hill Country.

Richardson, a former Marine Corps officer who was the U.S. Department of Homeland Security’s assistant secretary for countering weapons of mass destruction, had no background in emergency management when he was appointed in May. His leadership quickly came under fire in the aftermath of the Texas floods, which killed more than 130 people, including children at a summer camp along the Guadalupe River.

Lawmakers and local officials accused Richardson of failing to show urgency as the crisis unfolded. He didn’t travel to the region for days, later telling mem

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