President Biden blocked Japan's Nippon Steel from buying U.S. Steel last week, earning the approval of the United Steelworkers union, which desperately wanted the deal crushed. But steel workers themselves may be less than enthused.

President Joe Biden's decision to reject a bid by Nippon Steel to acquire U.S. Steel isn't the first time friction over trade and investment has irked Washington's closest ally in Asia.

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.