A debate ensued, in which the conclusions of Mr. Sumner were maintained by Mr. Seward, of New York, Mr. Fessenden, of Maine, Mr. Collamer, of Vermont, Mr. Crittenden, of Kentucky, and Mr. Stuart, of Michigan,--and controverted by Mr. Mason, of Virginia, Mr. Toucey, of Connecticut, and Mr. Cass, of Michigan. Mr. Mason proposed to amend the pending resolution by striking out the second clause, which amendment Mr. Sumner at once accepted, and closed the debate as follows. MR. PRESIDENT,--My desire is simply to bring the question before the Committee, and, to accomplish this, I shall not stand on the form of the resolution. I am aware that it is argumentative, and involves, perhaps, a reflection upon the course of the Executive; but I adopted this form purposely, from a desire that the resolution should tell the whole story on its face, and speak for itself. The ample debate that has occurred supersedes all such desire. The subject is fully before the Senate, and I doubt not will receive the attention of the Committee. In introducing this question, I remarked that it was of domestic concern under our own Constitution, with which, of course, Denmark has nothing to do. All references, therefore, to that power have been superfluous, if not illogical. Her consent is not sought in the proposed termination of the treaty. On the contrary, it will be terminated against her desires. We must look for our rule of conduct to our own Constitution. This I assume as an undeniable postulate. The discussion, though protracted, has not been unprofitable; but at each stage we have been brought back to the clear and unmistakable distinction between the power to make treaties and the power to abrogate them, under the Constitution. The President, by and with the advice and consent of the Senate, may make treaties; but there is nothing in our Constitution conferring upon them the power to abrogate treaties. To attribute to them any such power is to go beyond the Constitution. Nor has any Senator distinctly, and in terms, claimed for them this power. On the contrary, I think that Senators on the other side--both the Senator from Virginia and the Senator from Connecticut--admit that a treaty cannot be abrogated, except by virtue of an Act of Congress. I understood the Senator from Connecticut to make this admission, and I believe the Senator from Virginia did also. MR. MASON nodded assent. MR. TOUCEY. I mean, except by Act of Congress or a new treaty.