One America News is an obscure TV channel struggling to emerge from the cellar of the cable ratings, but it is nonetheless one of President Trump’s favorite media outlets. It’s not hard to see why: On One America newscasts, the Trump administration is a juggernaut of progress, a shining success with a daily drumbeat of achievements. One America — a tiny father-and-sons operation that often delivers four times as many stories per hour as its competitors — promises “straight news, no opinion,” promoting itself as the antidote to the Big Three cable news networks’ focus on punditry and the one...