.Biden prepping to obstruct Nippon Steel acquisition of USA Steel The Washington PostU.S. Steel says it could possibly leave Pittsburgh if Nippon package fails as Biden considers to shut out takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|U.S. Steel Warns of Plant Closings if Purchase Falls Down The Wall Street JournalBiden prepped to block US Steel purchase by Nippon Steel CNN.