Trump says General Motors should 'start moving back to America again'

President Donald Trump took aim at General Motors once again early Friday, urging the American automaker to shift its production from China. 
The broadside came days before planned escalations between the US and China, who have been mired in a trade dispute for more than a year.
The president ordered private US companies to immediately find alternative markets to China in a flurry of tweets last week, but the command carried no legislative weight. 
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