On World News Saturday, during the show’s "A Closer Look" segment, ABC anchor David Muir gave attention to those who question whether CNN’s Dr. Sanjay Gupta has sufficient qualifications to be Barack Obama’s surgeon general. Muir even played a clip of David Letterman poking fun at Gupta twice during the show: "The choice, it was between a Gupta, Dr. Phil, and a guy on Scrubbs. I don’t know what the hell-" He also recounted that Muir was forced to apologized to liberal filmmaker Michael Moore after making errors in a report fact-checking Moore’s film Sicko. As Muir gave voice to those in the pro-Gupta camp who believe it is important for the surgeon general to be well known to the public, the ABC anchor reminded viewers that Dr. C. Everett Coop talked about AIDS while President Reagan was "largely silent," and that President George W. Bush’s surgeon general resigned in protest in 2006 charging he had been "muzzled by the White House."