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U.S. crude rose above $88 a barrel after President Trump threatened sweeping economic action against Iran

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U.S. stock index futures slipped Thursday as oil prices surged following President Donald Trump's threat of sweeping economic measures against Iran. Dow Jones Industrial Average futures were off 124 points, or 0.2%, with S&P 500 futures down 0.1% and Nasdaq $NDAQ-100 futures retreating 0.2%.

U.S. crude futures jumped 3% to top $88 a barrel, with Brent crude hovering near $94 a barrel, after Trump took to Truth Social to promise what he described as the "most crushing economic operation ever taken against any country" against Iran. "This will be Economic Warfare and Isolation on an unprecedented scale," he wrote.