Two of the president’s longest-serving advisers allege in a new book that scores of officials inside the White House, Congress, the Justice Department and intelligence agencies are “embedded enemies of President Trump” working to stymie his agenda and delegitimize his presidency. The authors, Corey R. Lewandowski and David N. Bossie, are both Republican operatives who do not work in the administration but are close to Trump and fashion themselves as his outside protectors. They portray the president as victim to disloyalty on his staff and “swamp creatures” intent on extinguishing his political movement. Their book, “Trump’s Enemies: How the Deep...