Futures for the Dow Jones Industrial Average dropped 250 points, or 0.58%. S&P 500 futures slipped 0.6%, while Nasdaq futures fell 0.61%. The yield on the 10-year Treasury surged 4.6 basis point to 4.485% after Moody's downgraded the U.S. credit rating one notch late Friday to Aa1 from AAA, the highest grade.

U.S. stock futures point to a lower open after Moody's stripped the U.S. of its top credit rating. Moodys cut its credit rating on Friday a notch to Aa1 from Aaa due to likely difficulty financng the federal government’s growing budget deficit and the ramifications of rolling over existing U.