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.

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.

US President Donald Trump has approved a deal for Japanese company Nippon Steel Corp. to acquire US Steel Corp., the companies said in a statement on Saturday. The decision came despite Trump's earlier staunch opposition to the sale of US Steel to a Japanese company.