.Biden preparing to obstruct Nippon Steel investment of united state Steel The Washington PostU.S. Steel says it might leave Pittsburgh if Nippon deal falls through as Biden prepares to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|USA Steel Warns of Vegetation Closings if Purchase Falls Down The Stock market JournalBiden prepped to block US Steel acquisition by Nippon Steel CNN.