.Biden prepping to block out Nippon Steel investment of united state Steel The Washington PostU.S. Steel states it might leave behind Pittsburgh if Nippon deal flops as Biden considers to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York TimesExclusive|U.S. Steel Warns of Plant Closings if Sale Collapses The Stock market JournalBiden prepped to shut out United States Steel investment through Nippon Steel CNN.