Trump Pours Gas on GM’s Already Smoldering Relations With UAW

President Donald Trump’s Twitter barrage is unlikely to re-open an idled Ohio car plant. But his intervention in the matter will intensify what are already shaping up to be hard-fought negotiations between General Motors Co. and the United Auto Workers union.

In a series of tweets starting Saturday, Trump attacked both General Motors Co. and the UAW over the closing of a Chevrolet Cruze factory in Lordstown, Ohio. GM and the UAW each pushed back, but the two have otherwise been very much at odds entering bargaining over a new four-year labor contract. The president is making no bones about ...