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.

“I am proud to announce that, after much consideration and negotiation, U.S. Steel will REMAIN in America, and keep its Headquarters in the Great City of Pittsburgh,” Trump wrote on social media.

“This will be a planned partnership between United States Steel and Nippon Steel, which will create at least 70,000 jobs, and add $14 Billion Dollars to the U.S. Economy,” Mr. Trump wrote on social m...