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 Tonight with David Muir.

As Trump's latest tariffs take effect, Jay O'Brien reports on the massive demonstrations across the U.S. as protesters rally against the president's policies and Elon Musk; Morgan Norwood reports from Arkansas where life-threatening storms — for the fourth day — have unleashed floods that are swamping roads and stranding motorists; the IDF says it will investigate after a newly released video appeared to show aid workers and first responders being fired upon by Israeli soldiers in Gaza; and more on tonight's broadcast of World News Tonight with David Muir.