11:01 AM EST, 02/03/2025 (MT Newswires) -- United States Steel ( X ) and Nippon Steel said Monday they have filed their opening brief against former President Joe Biden and officials at the Committee on Foreign Investment in the United States over the decision to block their planned $14.9 billion merger.

The brief, filed in the US Court of Appeals for the District of Columbia Circuit, said Biden's decision was made for "political reasons, not national security." The Committee on Foreign Investment engaged in a "sham review of the transaction so that [Biden] could block it," the companies said.

Briefing is expected to be completed by March 17, with oral argument to follow, the companies said.

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