US market prediction today: S&P 500, Nasdaq futures fall up to 1.8% as AI fears hit Nvidia, Intel

US stock futures fell on Monday as AI slowdown warnings from Anthropic's Dario Amodei hit chip stocks, Brent crude jumped 4% to $108.65 on Middle East tensions, and traders priced in a 90% chance of a Fed rate hike on Wednesday amid rising inflation and Treasury yields nearing 5%.