.Biden readying to obstruct Nippon Steel acquisition of united state Steel The Washington PostU.S. Steel mentions it can leave Pittsburgh if Nippon deal falls through as Biden prepares to block requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The New York TimesExclusive|United State Steel Portend Vegetation Closings if Purchase Breaks Down The Exchange JournalBiden prepared to obstruct US Steel acquisition through Nippon Steel CNN.