U.S. Steel and Japan’s Nippon Steel sued the United States government on Monday in a last-ditch attempt to revive their attempted merger after President Biden blocked it last week on the basis that the transaction posed a threat to national security.

President-elect Trump has also opposed Nippon Steel's $15 billion acquisition of U.S. Steel, which President Biden blocked last week.

Sen. Mitch McConnell (R-Ky.) argued President Biden is selling out to Big Labor by blocking the sale of U.S. Steel to Japanese-owned Nippon Steel. “The Biden administration will leave America’s core economic and national-security interests less secure than it found them,