.Biden readying to shut out Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel claims it can leave Pittsburgh if Nippon package flops as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|USA Steel Portend Vegetation Closings if Sale Breaks Down The Exchange JournalBiden readied to shut out United States Steel investment through Nippon Steel CNN.