Trump said Monday that the United States would continue attacking Iran for “whatever it takes.”But what’s the “it” in that sentence?He also said: “We’re destroying Iran’s missile capability” and “annihilating their navy” and ensuring that “this sick and sinister regime” in Iran “can never obtain a nuclear weapon.”But how will we know when we’ve achieved any of this?American intelligence officials say Iran has not tried to rebuild its main nuclear sites since the U.S. attack in June. Iran’s stock...