.Biden prepping to block Nippon Steel purchase of U.S. Steel The Washington PostU.S. Steel says it can leave behind Pittsburgh if Nippon bargain flops as Biden considers to block requisition Pittsburgh Post-GazetteBiden Expected to Block USA Steel Takeover The The Big Apple TimesExclusive|USA Steel Portend Vegetation Closings if Purchase Falls Down The Exchange JournalBiden prepared to block out United States Steel acquisition by Nippon Steel CNN.