President Trump’s foreign policy advisers tend to have a short shelf life, with each personnel change sowing doubt about whether anyone really has the president’s ear. And then there is Mike Pompeo. “He is very solid on foreign policy — about U.S. interests, about NATO, about Russia, about our allies. … He is what you would want,” a former senior administration official said. “The challenge for someone in his position is to not be seen, ever, as distant from Trump.” As the last original member of Trump’s foreign policy cast, first as CIA director and now as secretary of state, he has met that challenge. The duration of his success in that effort, despite much upheaval within the administration, has exposed him to charges of sycophancy. His irascibility with journalists contributes to the idea that...