.Biden preparing to shut out Nippon Steel investment of united state Steel The Washington PostU.S. Steel mentions it could leave behind Pittsburgh if Nippon package flops as Biden prepares to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York City TimesExclusive|United State Steel Portend Vegetation Closings if Sale Collapses The Wall Street JournalBiden prepped to block US Steel purchase through Nippon Steel CNN.