.Biden prepping to block out Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel says it might leave Pittsburgh if Nippon bargain falls through as Biden intends to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York TimesExclusive|USA Steel Warns of Plant Closings if Purchase Falls Down The Exchange JournalBiden prepped to shut out United States Steel acquisition by Nippon Steel CNN.