Stock index futures inch lower as China hits back with tariffs on U.S. imports

Stock index futures were lower on Tuesday as China retaliated with a levy of tariffs on imports of multiple U.S. products.

S&P 500 futures (SPX) -0.1%, Nasdaq 100 futures (US100:IND) -0.1%, and Dow futures (INDU) -0.2%.

The 10-year Treasury yield (