Acting FEMA Administrator David Richardson resigned on Monday, according to multiple sources familiar with the situation.

Richardson, who was temporarily installed after former Acting Administrator Cam Hamilton was essentially fired by Secretary of Homeland Security Kristi Noem.

Richardson was also in charge of the department's countering Weapons of Mass Destruction office. It is unclear if he will still stay on in that role.

It is unclear who will lead the disaster management agency.

This is a developing story. Please check back for updates.

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