br 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. FILE PHOTO: Men look at stock quotation boards outside a brokerage in Tokyo, Japan, December 5, 2018. REUTERSIssei Kato Investors were unnerved by the U.S. federal government partial shutdown and President Donald Trump’s hostile stance toward the Federal Reserve chairman. U.S.