Nippon Steel and US Steel are suing the US government over blocking a takeover, claiming that President Joe Biden "ignored the rule of law to gain favor" with trade unions. The two companies also alleged that Biden, who is entering the last weeks of his presidency, stopped Nippon Steel buying US Steel to pursue his own political agenda.

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.

The foreign ministers of Japan and the United States said their countries' ties were stronger than ever on Tuesday, even after Japan's prime minister called U.S. President Joe Biden's decision to block Nippon Steel's $14.

Japan’s largest steelmaker said that it would not give up trying to purchase U.S. Steel even after President Joe Biden blocked the $15 billion bid last week.