U.S. stocks remained in the red Tuesday at midday, as oil prices slipped and Wall Street priced in an interest rate hike sooner rather than later. West Texas Intermediate crude fell 1.09 percent to $46.48 a barrel. Investors await Wednesday's weekly reading on crude inventories, which is expected to rise. The Conference Board's consumer confidence index rose to 101.1 in August, topping estimates of 97.3. The index stood at 96.7 in July. Shoe retailer DSW (DSW) slipped 9.6 percent after reporting a 1.2 percent decline in second-quarter same-store sales. The company reported earnings of $0.35 a share, beating estimates of $0.30. Potash (POT) shares rose 13.5 percent after Bloomberg reported the fertilizer maker is in talks to merge with Agrium (AGU) . Agrium shares rose 7.9 percent.