First and foremost, Iran most likely will move quickly, without any restraint, to enrich uranium, the fissile material needed for nuclear weapons. The Islamic Revolutionary Guards Corps, the leading edge of Iran’s nefarious actions, will declare that the West can never be trusted and will use the decision to undermine the less hard-line president, Hassan Rouhani.

The destruction of the nuclear deal will also increase the Revolutionary Guards’ malign activities in the Middle East, making the challenge to Israel’s security and to America’s other allies even more difficult. These activities, in turn, will increase American calls for military action against Iran as the only viable option, since no Iranian will be able to enter new negotiations with the United States any time soon.

The march to military conflict will be hard to stop, especially with Mr. Bolton leading the National Security Council.

Beyond this horror show, the decision to destroy the Iran deal will also pound yet another nail into the coffin of the trans-Atlantic relationship. Mr. Trump has so far laid the task of “fixing” the deal at the feet of Britain, France and Germany, America’s European partners in the nuclear negotiations. He has demanded that they agree to new language on Iran’s ballistic missile development and inspections of Iranian military installations, and he has asked for a change in the timeline of the nuclear deal so that the restrictions on Iran will not expire. In essence, he has asked Europe for help changing the terms of the deal itself.