.Biden prepping to block out Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel claims it could leave Pittsburgh if Nippon offer fails as Biden considers to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Requisition The New York TimesExclusive|USA Steel Portend Vegetation Closings if Purchase Falls Down The Stock market JournalBiden prepped to shut out United States Steel investment by Nippon Steel CNN.