The American people have the former national security advisor to blame for the presence of the self-serving brothers on the National Security Council staff. During his four decades as an accumulator of power in the nation’s capital, a holder of high offices in the State Department, and finally a stint as President Trump’s national security adviser, John Bolton has been well known for his scrupulous attention to the hiring and firing of his staff. He always has demanded unwavering personal loyalty as well as fealty to his own—not his president’s—policy agenda. He has performed the most rigorous vetting on all...