The National Portrait Gallery reopened with an addition to its famed exhibition of presidential portraits. Joining the likes of George Washington and Abraham Lincoln, was Donald Trump, scowling from behind the Resolute Desk in the Oval Office. Trump looks “pallid and grim” in the photograph, said Paul Staiti, expert on presidential portraits who teaches at Mount Holyoke College. Trump was impeached twice. His refusal to concede the election of Nov. 3, 2020, led a mob of his supporters to storm and vandalize the U.S. Capitol on Jan. 6. The Trump photograph is displayed across the room from a portrait of...