WASHINGTON :Shares of U.S. Steel rose 5 per cent on Monday, as a $14.9-billion bid for the well-known American firm from Nippon Steel approached the finish line and after details of the U.S. government's golden share emerged over the weekend. U.S. Steel shares hit $54.86, just short of the $55 Nippon Steel offer, after the Trump administration gave a green light to the merger on Friday via an executive order and a signed agreement to assuage national security concerns, capping off a tumultuous