.Biden readying to shut out Nippon Steel investment of united state Steel The Washington PostU.S. Steel claims it can leave Pittsburgh if Nippon deal falls through as Biden organizes to block out requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York TimesExclusive|U.S. Steel Warns of Vegetation Closings if Sale Falls Down The Exchange JournalBiden prepped to obstruct US Steel acquisition by Nippon Steel CNN.