The Trump administration is moving ahead with its intention to review and rescind national monument designations for some public lands. Now a leaked memorandum from Secretary of the Interior Ryan Zinke shows that he will be pointing to unproclamations of portions of national monuments by previous presidents as precedent.... None of the unproclamations were ever litigated, so there has never been a judicial determination of whether those reputable legal scholars are indeed correct. Now, however, if President Trump acts on Secretary Zinke’s recommendations, the time will come for such a test.