U.S. stocks tumbled on Monday, according to Reuters. The Dow Jones Industrial Average fell 650.19 points, or 2.29%, to 27,685.38. The S&P 500 lost 64.42 points, or 1.86%, to 3,400.97 and the Nasdaq Composite dropped 189.35 points, or 1.64%, to 11,358.94.