What you need to know on Wall Street today

Welcome to Finance Insider, Business Insider's summary of the top stories of the past 24 hours. Sign up here to get the best of Business Insider delivered direct to your inbox. After an uncharacteristic bout of silence, President Donald Trump has weighed in on the recent stock-market turmoil — and he's not happy.  Trump took to Twitter to argue that the decline was a "big mistake" that happened amid a strengthening US economy. Despite the unpredictability of markets, Trump has...