Stocks opened lower Wednesday as Wall Street investors continued to worry that U.S.-China trade talks may fail, despite the expected arrival of China’s top trade negotiator in Washington, D.C., on Thursday for more talks.

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Chinese negotiators last week walked back a number of concessions that had been agreed upon with American negotiators, according the U.S. Trade Representative Robert Lighthizer. In response, President Trump tweeted that on Friday he will sharply increase tariffs on Chinese goods.

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