US futures set for a weak open as global trade tensions ramp up By: CNBC.com News August 31, 2018 at 05:06 AM EDT U.S. stock index futures came under pressure ahead of Friday's open, as investors remained cautious as a NAFTA deadline drew closer. Read More >> Related Stocks: Dow Industrials SPDR Nasdaq ETF S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust