It was followed by a supplementary bill even more drastic, providing for a registration of voters, and requiring each person, before he could be registered, to take an oath that he had not been disfranchised for participation in any rebellion, or civil war, against the United States, and had never held any legislative, executive, or judicial office and afterwards engaged in rebellion against the United States, or given aid or comfort to the enemies thereof. The President was not slow to perceive the monstrosity of these provisions. In his veto message he dwelt on the absurdity of expecting every man to know whether he had been disfranchised or not, and what acts amounted to "participation" or fell short of it, and what constituted the giving of aid and comfort to the enemies of the United States. With genuine pathos he added: When I contemplate the millions of our fellow citizens of the South with no alternative left but to impose upon themselves this fearful and untried experiment of complete negro enfranchisement, and white disfranchisement (it may be) almost as complete, or submit indefinitely to the rigor of martial law without a single attribute of freemen, deprived of all the sacred guaranties of our Federal Constitution, and threatened with even worse wrongs, if any worse are possible, it seems to me their condition is the most deplorable to which any people can be reduced. This bill was passed over the veto on the 23d of March, Trumbull voting in the affirmative. These votes, however, did not prevent him from publishing in the Chicago _Advance_ of September 5, the same year, a carefully written article denying the power of Congress to regulate the suffrage in the states, concluding with the following paragraphs: If the views expressed are correct, it follows that there are but two ways of securing impartial suffrage throughout the Union. One is, for the states themselves to adopt it, which is being done by some already; and now that the subject is being agitated and its justice being made apparent, it is to be hoped it will soon commend itself to all: the other is, by an amendment to the Constitution of the United States, adopting impartial suffrage throughout the Union, which to become effective must be ratified by three fourths of the States. Amendments of the constitutions of Ohio, Kansas, and Minnesota for that purpose were then pending, but they were all voted down by the people in October and November, 1867.