.Biden preparing to block Nippon Steel investment of U.S. Steel The Washington PostU.S. Steel states it could leave behind Pittsburgh if Nippon offer flops as Biden organizes to block out takeover Pittsburgh Post-GazetteBiden Expected to Block United State Steel Requisition The New York City TimesExclusive|United State Steel Warns of Vegetation Closings if Purchase Breaks Down The Wall Street JournalBiden readied to block out US Steel acquisition by Nippon Steel CNN.