Nippon Steel Corp. won conditional US approval for its $14.1 billion purchase of United States Steel Corp., capping a lengthy saga in a tie-up that will create one of the world’s largest steel companies.

By Alexandra Alper (Reuters) -U.S President Donald Trump approved Nippon Steel's $14.9 billion bid for U.S. Steel on Friday, capping a tumultuous 18-month effort by the companies that survived union opposition and two national security reviews.

President Donald Trump signed an executive order Friday approving a partnership between US Steel and Nippon Steel after the companies reached agreement on US national security guarantees.