Nippon Steel Corp. and United States Steel Corp. claimed former President Joe Biden unfairly prejudged their $14.1 billion merger and gave the companies no chance for feedback on a “sham” national security review before he blocked the deal.

Nippon Steel and U.S. Steel have filed a lawsuit challenging the Biden administration's order to block the nearly $15 billion deal for the Japanese company to buy the American steelmaker.

U.S. Steel and Nippon Steel laid out their case Monday that then-President Joe Biden hamstrung a national security review to justify blocking the companies’ merger. An opening brief filed in the U.S.