Asian stocks retreat as U.S. political tumult adds to growth worry

TOKYO (Reuters) - Asian stock markets retreated again on Wednesday, extending a rout that began last week as U.S. political uncertainty exacerbated worries over slowing global economic growth.Investors were unnerved by the U.S. federal government partial shutdown and President Donald Trump's hostile stance towards the Federal Reserve chairman. U.S. Treasury Secretary Steven Mnuchin had also raised market concerns by convening a crisis group amid the pullback in stocks.S&P 500 emini futures were..