US Stock Market Today Highlights: US stock market ended mixed on Tuesday, with the S&P 500 and Nasdaq hitting record closing highs, led by a rally in semiconductor stocks amid AI-fueled optimism.The Dow Jones Industrial Average fell 118.02 points, or 0.23%, to 50,461.68, while the S&P 500 gained 45.65 points, or 0.61%, to 7,519.12. The Nasdaq Composite closed 312.21 points, or 1.19%, higher at 26,656.18.US Secretary of State Marco Rubio said negotiations with Iran could take “a few days,” while President Donald Trump noted in a post on Truth Social...