07:49 AM EST, 01/06/2025 (MT Newswires) -- United States Steel ( X ) and Nippon Steel said Monday they jointly filed a federal lawsuit seeking to dismiss President Joe Biden's blocking order, citing alleged violations of the constitutional guarantee of due process and unlawful political influence.

The companies have also filed suit against Cleveland-Cliffs ( CLF ) Chief Executive Lourenco Goncalves and United Steelworkers President David McCall for what they described as "illegal and coordinated actions" to prevent Nippon's acquisition of US Steel.