The suit, filed in the U.S. Court of Appeals for the District of Columbia, alleges that it was a political decision and violated the companies’ due process.

U.S. Steel and Nippon Steel on Monday filed a lawsuit against the U.S. government over President Joe Biden’s order blocking the sale of the Pittsburgh-based steel company to the Japanese firm. The lawsuit filed in the U.

Nippon Steel Corp. and United States Steel Corp. jointly filed lawsuits in a last-ditch effort to preserve the planned merger of the companies, which was blocked last week by President Joe Biden.