Summary: Here's everything you need to know before Friday's opening bell: China said it will place tariffs on U.S. imports in response to President Trump's tariff. Nike jumped premarket after its fiscal third-quarter sales and adjusted earnings topped Wall Street forecasts. Shares of Dropbox were priced at $21 each, above the projected range of $18 to $20. Shares of Micron appeared to fall do to profit-taking. U.S. stock futures moved lower on fears of a trade war. For more of the morning's biggest headlines, check out the Morning Jolt!
