.Biden preparing to block out Nippon Steel purchase of USA Steel The Washington PostU.S. Steel says it might leave behind Pittsburgh if Nippon package flops as Biden intends to shut out requisition Pittsburgh Post-GazetteBiden Expected to Block United State Steel Takeover The New York City TimesExclusive|United State Steel Warns of Vegetation Closings if Sale Breaks Down The Exchange JournalBiden readied to obstruct US Steel acquisition through Nippon Steel CNN.