The companies argued in a lawsuit announced on Monday that Biden violated the Constitution by blocking the merger via a sham national security review that deprived the companies of their right to a fair process.

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.

Japan’s Nippon Steel emphasized that it is not giving up on its takeover of U.S. Steel, a day after suing the Joe Biden administration over blocking the proposed merger.