The indictment says that Mr. Trump not only took from the White House classified documents that he was not authorized to possess but also that he showed them to visitors and political cronies at his country club. One of the documents involved a potential attack on another country, which The New York Times has reported was Iran. “Isn’t it amazing?” he asked one visitor, brandishing the document. During that conversation Mr. Trump acknowledged that he knew the document was “a secret,” the indictment said.