ABC World News Tonight with David Muir Full Broadcast - July 17, 2026

Matt Rivers reports on the more than 100 million people under air quality alerts, as new video shows hazardous Canadian wildfire smoke blanketing major cities from the Midwest to the East Coast, and Lee Goldberg has the forecast; Elizabeth Schulze has the latest on the the cyclosporiasis outbreak sickening thousands across the U.S., with supplier Taylor Farms voluntarily removing iceberg lettuce sourced from Mexico from the U.S. market; Victor Oquendo has details on the two Florida deputies lucky to be alive after authorities say they were ambushed with gunfire while searching for a suspect accused of holding his ex-girlfriend hostage; and more on tonight’s broadcast of World News Tonight with David Muir.