.Biden prepping to obstruct Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel mentions it can leave Pittsburgh if Nippon offer flops as Biden plans to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The The Big Apple TimesExclusive|U.S. Steel Warns of Plant Closings if Sale Breaks Down The Commercial JournalBiden prepped to shut out US Steel purchase through Nippon Steel CNN.