The Mag 7 faces new challenges. For Nvidia (NVDA), it comes in the form of a new A.I. chip from Huawei that has power comparable to Nvidia's H100 chip. Raymond James downgraded Amazon (AMZN) to outperform from strong buy, arguing investors are "underestimating" tariff risk to the company. MoffettNathanson cut its price target on Apple (AAPL) that suggests significant downside potential. Diane King Hall takes a closer look at this morning's market movers.