.Biden prepping to obstruct Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel says it might leave behind Pittsburgh if Nippon offer falls through as Biden considers to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The The Big Apple TimesExclusive|United State Steel Warns of Plant Closings if Purchase Breaks Down The Wall Street JournalBiden prepped to block out US Steel purchase through Nippon Steel CNN.