U.S. stock futures opened lower as trading commenced for September, reflecting ongoing concerns surrounding tariff rulings and an increase in Treasury yields. Recent court decisions have reignited uncertainty over tariffs, contributing to a decline in major indexes including the Dow, S&P 500, and Nasdaq. As bond yields climb, investors express caution ahead of key economic data releases anticipated for the week, including jobs data. Meanwhile, gold prices hover near record highs, indicating a shift toward safe-haven investments amid market volatility.