Markets had their worst day since 2020. The NDX plunged more than 5% while the SPX entered correction territory by tumbling close to 5%. President Trump's steeper-than-expected tariffs led to massive selling action in tech and the Mag 7. RH (RH) closed down 40% due to a triple whammy of lower earnings and guidance, topped by tariff uncertainty. One winner of the day: Intel (INTC), after The Information reported it and TSMC (TSM) eye a tentative agreement on a joint venture. Caroline Woods takes investors through the turbulent trading session.