Fox News has such an influence on Donald Trump that US journalists now react to the president’s proclamations on Twitter by searching for the Fox and Friends segment that inspired them. This intimate feedback loop between the Fox morning show and the president has made it “the most powerful TV show in America”, in the words of a New York Times critic. For Rupert Murdoch, a ruthless player in conservative politics across continents, such influence is striking. But it’s not new. Liberal critics of the administration, however, are now turning the spotlight on what they see as a troubling new...