.Biden prepping to block Nippon Steel acquisition of U.S. Steel The Washington PostU.S. Steel says it can leave Pittsburgh if Nippon bargain falls through as Biden plans to obstruct requisition Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The The Big Apple TimesExclusive|U.S. Steel Warns of Vegetation Closings if Purchase Falls Down The Wall Street JournalBiden prepped to block out United States Steel investment through Nippon Steel CNN.