This is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox. Happy Tuesday. Snap CEO Evan Spiegel with sit down with CNBC's Julia Boorstin at 2 p.m. ET today at the Augmented World Expo in California. Watch live on CNBC or CNBC+. Stock futures are near the flatline this morning. The market is coming off another winning day. Here are five key things investors need to know to start the trading day: News that the U.S. and Iran signed a memorandum of