How far the duty of the President "to preserve, protect, and defend the Constitution" requires him to go in opposing an unconstitutional act of Congress is a very serious and important question, on which I have deliberated much and felt extremely anxious to reach a proper conclusion. Where an act has been passed according to the forms of the Constitution by the supreme legislative authority, and is regularly enrolled among the public statutes of the country, Executive resistance to it, especially in times of high party excitement, would be likely to produce violent collision between the respective adherents of the two branches of the Government. This would be simply civil war, and civil war must be resorted to only as the last remedy for the worst of evils. Whatever might tend to provoke it should be most carefully avoided. A faithful and conscientious magistrate will concede very much to honest error, and something even to perverse malice, before he will endanger the public peace; and he will not adopt forcible measures, or such as might lead to force, as long as those which are peaceable remain open to him or to his constituents. It is true that cases may occur in which the Executive would be compelled to stand on its rights, and maintain them regardless of all consequences. If Congress should pass an act which is not only in palpable conflict with the Constitution, but will certainly, if carried out, produce immediate and irreparable injury to the organic structure of the Government, and if there be, neither judicial remedy for the wrongs it inflicts nor power in the people to protect themselves without the official aid of their elected defender--if, for instance, the legislative department should pass an act even through all the forms of law to abolish a coordinate department of the Government--in such a case the President must take the high responsibilities of his office and save the life of the nation at all hazards. The so-called reconstruction acts, though as plainly unconstitutional as any that can be imagined, were not believed to be within the class last mentioned. The people were not wholly disarmed of the power of self-defense. In all the Northern States they still held in their hands the sacred right of the ballot, and it was safe to believe that in due time they would come to the rescue of their own institutions. It gives me pleasure to add that the appeal to our common constituents was not taken in vain, and that my confidence in their wisdom and virtue seems not to have been misplaced.