The Diplomat PNG Season 3 Episode 7 Editor’s Rating 4 stars * * * * « Previous Next « Previous Episode Next Episode » Kate and Callum get into a shouting match about American exceptionalism, which is how you know this relationship is probably doomed. Photo: Netflix “PNG” (that’s short for “persona non grata”, not an image file type) is all about binary options and arguments. President Penn will apologize to Prime Minister Trowbridge, or she’ll shrug off wholesale global disapproval. Kate is