Donald Trump must move hard and fast to get his agenda enacted. He’s going to be opposed not only by the bureaucrats of the Deep State but by, to some extent, the courts, congressional Democrats, and soft Republicans. Fortunately, President Trump, as chief executive – the unitary executive – has tremendous authority. He and his appointees, as well as Republicans in Congress, must use it. They will feel considerable pressure to be soft and weak, not only from the regime media but from the...