Wall Street’s rally fizzles as uncertainty returns amid Trump’s trade war

Wall Street’s big three-day rally is running out of steam, and U.S. stocks are drifting in mixed trading Friday as they near the end of another roller-coaster week.

The S&P 500 was 0.1% lower in midday trading, as nearly three out of every four stocks fell within the index. The Dow Jones Industrial Average was down 237 points, or 0.6%, as of 11:30 a.m. Eastern time, while the Nasdaq composite was 0.3% higher thanks to gains for a handful of influential Big Tech stocks.

Intel...