President Joe Biden is expected to block the $14.9 billion acquisition of U.S. Steel by Japan's Nippon Steel due to significant political and public opposition. Key figures, including Senators Kamala Harris and Donald Trump, have voiced concerns about the sale, arguing that U.S. Steel should remain American-owned to protect jobs and national security. U.S. Steel has warned that blocking the deal could lead to plant closures, layoffs, and a potential relocation of its headquarters from Pittsburgh. The United Steelworkers union has consistently opposed the acquisition, citing fears for workers' futures. Nippon Steel had proposed substantial investments in U.S. Steel's facilities, but critics remain skeptical about the deal's implications for American manufacturing. The situation has raised alarms about the potential chilling effect on foreign investments in the U.S. amid heightened scrutiny of national security implications.