President Donald Trump on Friday announced a partnership between United States Steel Corp. and Japan’s Nippon Steel Corp., shocking markets with an agreement he said would keep the once-iconic American firm in the US but otherwise providing no specifics.

President Donald Trump says U.S. Steel will keep its headquarters in Pittsburgh as part of what he called a “partnership” between the American steelmaker and Japan-based Nippon Steel, which sought to buy it.

President Donald Trump announced a partnership between U.S. Steel and Japanese steelmaker Nippon that he says will keep the headquarters in Pittsburgh and draw $14 billion in investment toward the US economy.