.Biden prepping to block out Nippon Steel purchase of USA Steel The Washington PostU.S. Steel claims it could possibly leave behind Pittsburgh if Nippon package flops as Biden organizes to block out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York TimesExclusive|USA Steel Warns of Plant Closings if Sale Breaks Down The Stock market JournalBiden prepared to block out US Steel acquisition through Nippon Steel CNN.