.Biden preparing to block out Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel mentions it could leave behind Pittsburgh if Nippon deal flops as Biden considers to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York City TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Collapses The Commercial JournalBiden readied to shut out United States Steel purchase through Nippon Steel CNN.