Mid Continent Nail Corporation says it could shutter its Poplar Bluff plant, which employs about 335 workers, as early as this month without an exemption to tariffs, the site’s operations general manager, Chris Pratt, told reporters in early September. The company previously had said that it might not survive through Labor Day but stayed open. After Trump imposed a 25 percent tariff on imported steel, the company in June cut 60 of 500 positions at the plant in rural Butler County, where the unemployment rate is above the national average and the company is the area’s second-largest employer. Pratt said...