Big banks kicked off earnings season with strong results, but the broader market was more focused on tariffs. Strong earnings reports from big banks couldn't lift the market early on Tuesday after the latest development in the U.S.-China trade spat gave Wall Street whiplash. The Dow Jones Industrial Average fell 510 points, or 1.1%. The S&P 500 was down 1.3%. The Nasdaq Composite was down 1.9%. ...