Nippon Steel said it wouldn't be deterred by Biden’s decision last week to block its $15 billion bid for the storied U.S. steelmaker.

U.S. Steel and its would-be Japanese suitor filed twin lawsuits Monday to defend their $15 billion merger. President Biden issued an order on Friday to block the deal, citing national security concerns.

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

Japan and the U.S. reaffirm strong ties despite tensions over Biden's decision to block Nippon Steel's merger with U.S. Steel. This move sparks political backlash but is unlikely to damage bilateral relations,

The Japanese firm’s planned purchase of its U.S. rival was blocked last week by President Joe Biden after a year of diplomatic tension, political debate and lobbying efforts from the companies and unions. Biden, who had previously said he opposed the tie-up, cited national-security risks, despite Japan being a close ally.

President Biden has blocked a deal between U.S. Steel and Japan's Nippon Steel that could impact the relationship with the American ally and have global economic repercussions. CBS News' Nicole Sganga has more.

By David Shepardson, Tim Kelly, Andrea Shalal WASHINGTON/TOKYO (Reuters) -U.S. President Joe Biden blocked Nippon Steel's proposed $14.9 billion purchase of U.S. Steel on Friday, citing national security concerns,

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

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.

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.

U.S. President Joe Biden's decision to block Nippon Steel's $14.9 billion bid for U.S. Steel casts a shadow over Secretary of State Antony Blinken's visit to Japan on Tuesday for farewell meetings with Washington's most important ally in Asia.