This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Good morning. The Boston Marathon is today, and I'm feeling particularly inspired by this runner who went from being partially paralyzed to running in this year's race. Stock futures are falling this morning. The three major indexes are coming off a winning week. Here are five key things investors need to know to start the trading day: Investors are back on defense after President Donald Trump

Tag-uri: Donald Trump