Vice President Kamala Harris used a joint campaign appearance with President Joe Biden in the critical swing state of Pennsylvania on Monday to say that U.S. Steel should remain domestically owned — concurring with the White House's monthslong opposition to the company's planned sale to Japan's Nippon Steel. Her comments came during a rally before cheering union members marking Labor Day in the industrial city of Pittsburgh, where Harris said U.S. Steel was "an historic American company and...