US futures set for a tepid open after boost from US-Mexico trade deal By: CNBC.com News August 28, 2018 at 05:07 AM EDT U.S. stock index futures fluctuated ahead of Tuesday’s open, as investors kept an eye on news coming out of the political space. Read More >> Related Stocks: Dow Industrials SPDR Nasdaq ETF S&P 500 Ishares Core ETF SPDR S&P 500 ETF Trust