.Biden readying to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel mentions it can leave Pittsburgh if Nippon bargain flops as Biden plans to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York TimesExclusive|USA Steel Warns of Plant Closings if Purchase Falls Down The Wall Street JournalBiden prepared to block out US Steel investment by Nippon Steel CNN.