President Biden blocked the deal between Nippon and U.S. Steel earlier this month due to "national security" concerns.

U.S. Steel and Nippon Steel said on Monday that it is suing over President Joe Biden's decision to block its sales agreement and a domestic competitor and union over their actions to scuttle the deal.

President Joe Biden has rejected the nearly $15 billion proposed deal for Nippon Steel of Japan to purchase Pittsburgh-based U.S. Steel.

President Joe Biden on Friday announced his decision to block the $14 billion sale of U.S. Steel to Japan’s Nippon Steel, citing national security concerns. The move could have serious implications in Gary,

Trump opposes U.S. Steel's sale to Nippon, but CEO David Burritt believes he can convince the president-elect that the deal is in the interest of U.S. workers.

In a joint statement, Nippon and U.S. Steel called Biden’s decision “a clear violation of due process and the law’’ and suggested they would sue to salvage their deal: “We are left with no choice but to take all appropriate action to protect our legal rights.’’

In dual lawsuits filed Jan. 6, U.S. Steel Corp. and Nippon Steel Corp. blame the Biden administration's politicizing its national-security review as well as the behind-the-scenes actions by rival Cleveland-Cliffs Inc. and United Steelworkers International President David McCall for scuttling the $14.9 billion deal.

The companies condemned the president's decision and hinted at taking legal action, while U.S. Steel's CEO accused Biden of "political corruption."

Both Biden and President-elect Donald Trump have courted unionized workers at U.S. Steel and vowed to block the acquisition amid concerns about foreign ownership of a flagship American company.

When, on Friday, the Supreme Court hears the Biden administration defend the law that bans TikTok, the justices should remember what the administration said the previous Friday: “National security” justifies the president’s blocking the sale of U.

A 123-year-old steelmaker’s fate could yet become a restraint on modern-day executive power. United States Steel and suitor Nippon Steel have gone to court over U.S. President Joe Biden’s decision to nix their $15 billion deal.