(Reuters) - United Steelworkers president David McCall filed a motion to dismiss a lawsuit filed against him by U.S. Steel and Nippon Steel, the union said on Wednesday.

Nippon Steel (JP:5401) and U.S. Steel (X) are trying to save their $14.9 billion merger deal by filing an opening brief in the U.S. Court of

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.

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 are asking a court to lift the block of their $14.9 billion merger. The steelmakers filed their opening brief in the U.S. Court of Appeals for the District of Columbia Circuit against former President Joe Biden and the Committee on Foreign Investment in the United States.