President Donald Trump suggested on Friday that General Motors Co (GM), the largest automaker in the United States, should begin returning operations to the United States.In the midst of the trade dispute with Beijing, Trump recalled that "large plants" of General Motors were taken to China before he assumed the presidency."General Motors, once the Detroit Giant, is now one of the smallest car manufacturers there," Trump wrote on Twitter."They took large plants to China (...) That despite the saving aid that the US gave them Now they...