.Biden readying to obstruct Nippon Steel investment of united state Steel The Washington PostU.S. Steel mentions it could possibly leave Pittsburgh if Nippon package flops as Biden organizes to obstruct takeover Pittsburgh Post-GazetteBiden Expected to Block U.S. Steel Takeover The The Big Apple TimesExclusive|USA Steel Portend Vegetation Closings if Sale Breaks Down The Exchange JournalBiden prepared to block US Steel investment by Nippon Steel CNN.