.Biden preparing to block Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel claims it might leave behind Pittsburgh if Nippon deal fails as Biden intends to block requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The The Big Apple TimesExclusive|United State Steel Warns of Plant Closings if Purchase Collapses The Stock market JournalBiden prepped to block out US Steel investment through Nippon Steel CNN.