SAN DIEGO (AP) — The acting chief of the Federal Emergency Management Agency left his job Monday after just six months, according to the Department of Homeland Security, the latest disruption in a year of mass staff departures, program cuts and policy upheaval at the agency charged with managing federal disaster response.

David Richardson, who in his brief term remained largely out of public sight, is leaving the post after he faced a wave of criticism for his handling of the deadly Texas floods earlier this year. He replaced previous acting head Cameron Hamilton in May.

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