Trump pledged to block U.S. Steel merger with Nippon, but his inner circle is pushing for the deal TribLIVECleveland Cliffs offers to buy unionized mills US Steel is threatening to close CNNBiden close to blocking Nippon Steel deal to buy U.S. Steel, sources say ReutersU.S. Steel Threatens to Go Rogue The American ProspectShapiro steps up negotiations as Biden’s potential block of U.S. Steel deal jolts region Pittsburgh Post-Gazette