The head of FEMA’s Urban Search and Rescue branch, which runs a network of teams stationed across the country that can swiftly respond to natural disasters, resigned on Monday.

Ken Pagurek, a longtime Philadelphia firefighter who served as chief of FEMA’s search and rescue branch for the past year, was well-versed in major disaster response.

FEMA’s search and rescue chief resigned because of ICE Barbie Kristi Noem’s sluggish response to the Texas flooding disaster, sources have told CNN. Ken Pagurek had become increasingly frustrated with the Trump administration’s efforts to dismantle the Federal Emergency Management Agency,