Donald Trump has been the greatest, most clear-eyed, and most transformative foreign policy president of my lifetime. But Trump is also the famed businessman who wrote "The Art of the Deal" four decades ago. There has therefore always been the risk that the president's novel and often unorthodox approach to foreign policy could be subsumed by a greater dealmaking imperative.

Prudent statesmanship on the world stage requires setting clear ends and then working backward to calibrate the appropriate means — diplomatic, economic, military or otherwise — to achieve those ends. Because of his dealmaking background, Trump — despite all his foreign policy successes — was always uniquely vulnerable to confusion between means and ends, prioritizing a deal itself above any end that a deal might be meant to secure.

That is how we got to this troubling week in U.S. foreign policy — namely, the deeply flawed new "memorandum of understanding" between the U.S. and the Islamic Republic of Iran, which represents the single greatest subsumption of noble ends into politically convenient means in at least a decade of American diplomacy.

The Iran appeasement, primarily negotiated and championed by Vice President JD Vance but ultimately bearing Trump's signature, raises at least two crucial questions. First, can Americans somehow believe that Iran will uphold its commitments, given its history of deceiving and lying at every turn? Second, what does this mean for Trump's legacy and successor plans, as they pertain to the Middle East and 2028........

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