By Steve Holland and Alexandra Alper WASHINGTON (Reuters) -Shares of U.S. Steel rose 5% 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.

Administration officials secured a deal that will give the president unusual influence over a private company, and could serve as a model for other deals.

U.S. Steel and Japan's Nippon Steel said Trump had approved their merger after they signed a national security agreement with the U.S. government.