The Dow Jones industrial average fell 54.3 points, or 0.3 percent, to 18,253.85, the S&P 500 lost 7.07 points, or 0.33 percent, to 2,161.2 and the Nasdaq Composite dropped 11.13 points, or 0.21 percent, to 5,300.87.
An index of stocks across the world ended flat on Monday while Wall Street dipped, and oil prices rose to a three-month high after Iran's leader called on non-OPEC producers to help support prices.
