President Obama has a final chance to shape his legacy as a peacemaker by putting out parameters for resolving the Israeli-Palestinian conflict, ideally in a concise, balanced UN Security Council resolution. It would be the Council’s first engagement on all the conflict’s core issues and expand the international role, one of many needed peace process adjustments. Enshrining principles, if not via the Council then at least by the Quartet or in another multilateral framework is but one of several needed changes to Israeli-Palestinian negotiations. But it is the most consequential move with the prospect of being accomplished today. If a two-state settlement is eventually reached, it will be remembered as an historic contribution, the most important U.S.-backed peace initiative since the occupation began. For President-elect Trump, who said he “would love to be able to be the one that made peace with Israel and the Palestinians”, and he has “reason to believe I can do that”, internationally-endorsed parameters would better position him for that goal than any recent predecessor.