Federalist No. 64 is an essay by John Jay, the sixty-fourth of The Federalist Papers. It was published on March 5, 1788 under the pseudonymPublius, the name under which all The Federalist Papers were published. It is titled, "The Powers of the Senate." This theme was continued in Federalist No. 65, but that essay was written by Alexander Hamilton; No. 64 is the last of Jay's five contributions to the series.
The paper addresses critics' oppositions towards the concurrent power of the President and the Senate to make and approve treaties respectively. According to Jay, the United States would not be able to establish international credibility if the terms of a treaty could be sporadically changed by Congress.