US STOCKS-S&P 500 eases amid U.S.-China trade uncertainty

* Trump, Mnuchin say U.S.-China trade talks progressing
quickly

JEFFREY LIPTON in BARBADOS – http://feeds.reuters.com/~r/reuters/companyNews/~3/QG7tOg_7zFM/us-stocks-sp-500-eases-amid-u-s-china-trade-uncertainty-idUSL1N2111WO