.Biden prepping to block out Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel says it could leave behind Pittsburgh if Nippon bargain flops as Biden prepares to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The Nyc TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Breaks Down The Wall Street JournalBiden prepared to obstruct US Steel purchase by Nippon Steel CNN.