What are the major breaking news stories covered in tonight's ABC World News broadcast?

Tonight's ABC World News with David Muir covers several critical breaking news stories. The broadcast focuses on significant political developments including mass firings at federal agencies and President Trump's new tariff plans following recent inflation data. Additionally, the program addresses the confirmation of Robert F. Kennedy Jr. as Secretary of Health and Human Services. The coverage extends beyond politics to include severe weather updates about a major winter storm impacting the United States and international news regarding a car attack in Munich. The broadcast also highlights heartwarming human interest stories, including passengers helping a mother give birth on the subway and a kayaker's close encounter with a humpback whale, demonstrating the program's comprehensive approach to current events.