Heidi Gutman/ABC News David Muir is the anchor and managing editor of ABC World News Tonight with David Muir, the most-watched newscast in the U.S., and co-anchor of ABC’s 20/20. Muir’s ...

Donald Trump Jr. was one of many people who criticized ABC's David Muir for his choice of attire while covering the devastating wildfires in California last week. Muir, who has been with ABC News ...