Nippon Steel and US Steel sue Biden administration over blocked merger

U.S. Steel and Japanese steelmaker Nippon Steel sued the U.S. government Monday in a last-ditch effort to move forward with their merger, which President Biden blocked Friday over national security concerns.

The new lawsuit accuses Biden of interfering in the merger review process for political gain and to curry favor with the United Steelworkers Union (USW).

The companies in a separate lawsuit on Monday alleged the USW illegally colluded with steelmaker Cleveland-Cliffs, which previously tried to purchase U.S. Steel...