By David Brunnstrom, Simon Lewis, Trevor Hunnicutt and Tim Kelly TOKYO/WASHINGTON (Reuters) -The foreign ministers of Japan and the United States said their countries' ties were stronger than ever on Tuesday,

The president said he was moving to protect national security in deciding the fate of the iconic Pennsylvania-based company, which became a contentious political issue in an election year.

Japan's prime minister on Monday urged Washington to dispel concerns that a decision by Joe Biden to block Nippon Steel's takeover of US Steel could impact future investments. Prime Minister Shigeru Ishiba said the veteran Democrat's decision had sparked worries over future Japanese investments in the world's largest economy.

Nippon Steel touted the $14.9 billion deal as a lifeline for its rusting US rival, but opponents warned that the Japanese firm would slash jobs -- despite assurances to the contrary.

US Secretary of State Antony Blinken was in Japan on Tuesday for talks expected to address North Korean missile launches, but President Joe Biden's blocking of a steel deal is straining the allies' warm ties.

President Joe Biden on Friday announced he has blocked the controversial $14.9 billion sale of US Steel to Japan's Nippon Steel, citing a strategic need to protect domestic industry.There was rare bipartisan agreement on the issue,

Reportedly, Nippon Steel is set to file a lawsuit in response to United States President Joe Biden blocking the Japanese company's $14.1 billion takeover of US Steel.

Japan’s largest steelmaker said that it would not give up trying to purchase U.S. Steel even after President Joe Biden blocked the $15 billion bid last week.

US Secretary of State Antony Blinken insisted during a visit to Tokyo on Tuesday that ties with Japan were stronger than ever, days after President Joe Biden blocked Nippon Steel's takeover of US Steel.