Goldman Sachs Group Inc. Chairman and Chief Executive Lloyd Blankfein criticized China’s handling of its stock-market swoon in an interview that also included the Wall Street veteran’s views on Donald Trump and the Federal Reserve’s interest-rate decision.

Mr. Blankfein reserved some of his toughest remarks on Wednesday for China’s handling of its recent market difficulties. “They don’t have a lot of experience in this market stuff,” Mr. Blankfein said. Some of the decisions, he noted, have been “sloppy” and “ham-handed.”

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