Futures point to a lower open on geopolitical concerns By: CNBC.com News May 15, 2018 at 04:54 AM EDT U.S. stock index futures pointed to a lower open on Tuesday morning, amid concerns of increased violence on the Israeli-Gaza border. Read More >> Related Stocks: Dow Industrials SPDR PowerShares QQQ S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust