.Biden preparing to obstruct Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon package flops as Biden considers to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block USA Steel Requisition The New York City TimesExclusive|USA Steel Portend Vegetation Closings if Sale Falls Down The Commercial JournalBiden prepped to shut out United States Steel investment by Nippon Steel CNN.