US stock futures slipped into the red on Tuesday, struggling to build on a broad tech-led rebound that was fueled by growing optimism that the Federal Reserve will deliver a rate cut next month. Futures linked to the Dow Jones Industrial Average (YM=F) and to the S&P 500 (ES=F) both hovered below the flatline. Contracts on the tech-heavy Nasdaq 100 (NQ=F) ticked down 0.1%, after Monday’s session delivered a strong start to the holiday-shortened trading week. Stocks are trying to hold onto the momentum t ...