...Don Luskin of Trend Macrolytics wrote to clients about Mr. Trump’s plan for new tariffs—essentially taxes on steel and aluminum consumers: "Trump’s economic record has been excellent, and we draw assurance from that. But the very fact that this is his first big mistake requires markets to let him know he’s making it – which is one reason we think this has to prolong the present stock market correction. Considering that Trump has bragged so often about the rising stock market, presumably he would listen when it sends him a message."