.Biden preparing to block out Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon offer flops as Biden plans to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|USA Steel Warns of Plant Closings if Purchase Breaks Down The Exchange JournalBiden prepared to obstruct United States Steel investment through Nippon Steel CNN.