_Thirdly._ There is another source for this jurisdiction common alike to Congress and the President. It is found in the constitutional provision, that “the United States shall guaranty to every State in this Union a republican form of government, and shall protect each of them against invasion.” Here, be it observed, are words of guaranty and an obligation of protection. In the original concession to the United States of this twofold power there was open recognition of the ultimate responsibility and duty of the National Government, _conferring jurisdiction above all pretended State Rights_; and now the occasion has come for the exercise of this twofold power thus solemnly conceded. The words of twofold power and corresponding obligation are plain, and beyond question. If there be any ambiguity, it is only in what constitutes a republican form of government. But for the present this question does not arise. It is enough that a wicked rebellion has undertaken to detach certain States from the Union, and to take them beyond its protection and sovereignty, with the menace of seeking foreign alliance and support, even at the cost of every distinctive institution. It is well known that _Mr. Madison anticipated this precise danger from Slavery, and upheld this precise grant of power in order to counteract the danger_. His words, which will be found in a yet unpublished document produced by Mr. Collamer in the Senate, seem prophetic. Among the defects he remarked in the old Confederation was what he called “want of guaranty to the States of their constitutions and laws _against internal violence_.” In showing why this guaranty was needed, he says, that, “according to republican theory, right and power, being both vested in the majority, are held to be synonymous; according to fact and experience, a minority may, in an appeal to force, be an overmatch for the majority”; and he then adds, in words of wonderful prescience, “_Where Slavery exists, the republican theory becomes still more fallacious_.”[209] This was written in April, 1787, before the meeting of the Convention that formed the National Constitution. Here is the origin of the very clause in question. The danger which this statesman foresaw is now upon us. When a State fails to maintain a republican government, _with officers sworn according to requirement of the Constitution_, it ceases to be a constitutional State. The very case contemplated by the Constitution has arrived, and the National Government is invested with plenary powers, whether of peace or war. There is nothing in the storehouse of peace, and there is nothing in the arsenal of war, it may not employ in the maintenance of this solemn guaranty, and in the extension of that protection against invasion to which it is pledged. But this extraordinary power carries with it corresponding duty. Whatever shows itself dangerous to a republican form of government must be removed without delay or hesitation; and if