America's federal watchdog has launched a formal audit into how the Department of Homeland Security spent nearly £760m ($1bn) buying warehouses at above-market rates, targeting Kristi Noem's £28.6bn ($38.3bn) plan to overhaul ICE detention. The Department of Homeland Security's Office of Inspector General confirmed it is reviewing ICE's acquisition of detention space, focusing squarely on the ICE Detention Reengineering Initiative that Noem cham…