Rebecca Jarvis reports on Pres. Trump’s sweeping new tariffs that have sent stocks plummeting, leading to the markets’ worst day since the start of the pandemic five years ago; Victor Oquendo has the latest on the multi-day, life-threatening that has killed at least six people; Rachel Scott has details after sources tell ABC News that Pres. Trump fired six National Security Council staffers following a meeting with far-right activist Laura Loomer; and more on tonight’s broadcast of World News