Finer details of the partnership between U.S. Steel Corp. and Japan’s Nippon Steel Corp. remained elusive Friday after President Donald Trump touted the deal as a “blockbuster” agreement worth more than $14 billion in investments — while also announcing he will double U.

President Trump said on Friday that he would double the tariffs he had levied on foreign steel and aluminum to 50 percent, a move that he claimed would further protect the industry.