The Dow Jones Industrial Average and fell for a second day in a row on Wednesday as investors grappled with key testimonies on U.S.-China trade relations, Federal Reserve monetary policy as well as a host of geopolitical issues.

The 30-stock Dow dipped 72.82 points to 25,985.16 as UnitedHealth underperformed. The S&P 500 slipped less than 0.1 percent to 2,792.38, led lower by the communications services and health care sectors. The Nasdaq Composite eked out a small gain, closing nearly 0.1 percent higher at 7,554.51.