A trans-Atlantic wave of puzzlement is rippling across Sweden for the second time in a week, after a prominent Fox News program featured a “Swedish defense and national security advisor” who’s unknown to the country’s military and foreign-affairs officials. Swedes, and some Americans, have been wondering about representations of the Nordic nation in the U.S. since President Donald Trump invoked “what’s happening last night in Sweden” while alluding to past terror attacks in Europe during a rally Feb. 18. There hadn’t been any major incident in Sweden the previous night.