May 23 (Reuters) - U.S. stock index futures turned lower

on Friday as shares of Apple ( AAPL ) dropped after U.S. President Donald

Trump said the company would have to pay a 25% tariff if phones

sold in the country are not made within its borders.

Shares of the iPhone maker dropped 3.1% to $195.26

in premarket trading.

At 07:29 a.m. ET, Dow E-minis were down 126 points,

or 0.3%, S&P 500 E-minis were down 19 points, or 0.32%,

and Nasdaq 100 E-minis were down 88.25 points, or 0.42%.