The Biden administration is preparing to block Nippon Steel's proposed $14 billion acquisition of U.S. Steel, citing national security concerns. President Biden's stance is supported by U.S. Senate Democrats, including Senator Bob Casey, who emphasize the deal's potential negative impact on American workers and industry. U.S. Steel CEO David Burritt has warned that if the acquisition fails, the company may need to close plants and relocate its headquarters, which would further jeopardize jobs in Pennsylvania. Despite Nippon Steel arguing that the acquisition would enhance U.S. national security by improving domestic production capabilities, bipartisan political resistance has grown against the deal. The review by the Committee on Foreign Investment in the United States (CFIUS) is nearing completion, with Biden expected to formally block the deal soon, as U.S. Steel's stock has already dropped significantly in anticipation of this decision. The situation highlights the tensions in U.S.-Japan trade relations, particularly in the context of national security and economic interests.