U.S. President Joe Biden is set to block Nippon Steel Corp.'s plan to acquire United States Steel Corp. on national security grounds, media reports said Wednesday.It would be a rare rejection of a proposed buyout by a company from Japan, a key U.S. ally. With votes from blue-collar workers seen as critical in the U.S. presidential election in November, both Biden and Vice President Kamala Harris have voiced opposition to the takeover plan, without providing a detailed rationale.The Washington Post reported Biden is planning to announce that he will formally block the acquisition by Japan's …READ FULL ARTICLE