.Biden readying to block Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel mentions it could possibly leave Pittsburgh if Nippon bargain flops as Biden plans to block requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The Nyc TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Breaks Down The Commercial JournalBiden prepped to block out US Steel acquisition by Nippon Steel CNN.