.Biden readying to block out Nippon Steel investment of united state Steel The Washington PostU.S. Steel states it could possibly leave Pittsburgh if Nippon package fails as Biden prepares to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York City TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Falls Down The Commercial JournalBiden prepped to block out US Steel purchase through Nippon Steel CNN.