This 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: Wall Street may be losing some of its excitement for artificial intelligence, but the battle among major technology companies for dominance in the field hasn't cooled. After the bell today, investor attention will zero in on just one event: Nvidia 's earnings report. Here's the latest on Nvidia and the sector: Target posted