U.S. stock index futures continued to decline on Tuesday, with Tesla down 2.7% after hours.

U.S. stock index futures continued to fall on Tuesday, with Nasdaq futures down more than 0.7 percent, Tesla (TSLA. O) down 2.7 percent after hours, and Apple (AAPL. O) and NVIDIA (NVDA. O) both down more than 1 percent.