Treaties Don't Belong to Presidents Alone Presidents don't have the power to enter into treaties unilaterally. This requires the consent of two-thirds of the Senate, and once a treaty enters into force, the Constitution makes it part of the "supreme law of the land" � just like a statute. Presidents can't terminate statutes they don't like. They must persuade both houses of Congress to join in a repeal. Should the termination of treaties operate any differently? The question first came up in 1798. As war intensified in Europe, America found itself in an entangling alliance with the French under treaties made during our own revolution. But President John Adams did not terminate these treaties unilaterally. He signed an act of Congress to "Declare the Treaties Heretofore Concluded with France No Longer Obligatory on the United States." http://www.nytimes.com/2001/08/29/opinion/29ACKE.html