Traders work on the floor of the New York Stock Exchange on Dec. 11, 2025, in New York City.Spencer Platt | Getty ImagesThis is CNBC's Morning Squawk newsletter. Subscribe here to receive future editions in your inbox.Here are five key things investors need to know to start the trading day:1. Cold front2. The KevinsKevin Hassett, director of the National Economic Council (L), and Kevin Warsh, former governor of the U.S. Federal Reserve.ReutersFormer Federal Reserve Governor Kevin Warsh has made his way to t ...