“To say that any state may at pleasure secede from the Union is to say that the United States are not a nation, because it would be a solecism to contend that any part of a nation might dissolve its connection with the other parts, to their injury or ruin, without committing any offense. Secession, like any other revolutionary act, may be morally justified by the extremity of oppression; but to call it a constitutional right is confounding the meaning of terms, and can only be done through gross error or to deceive those who are willing to assert a right, but would pause before they made a revolution or incur the penalties consequent on a failure.
Disunion by armed force is treason. Are you really ready to incur its guilt? If you are, on the heads of the instigators of the act be the dreadful consequences; on their heads be the dishonor, but on yours may fall the punishment. On your unhappy state will inevitably fall all the evils of the conflict you force upon the government of your country. It cannot accede to the mad project of disunion, of which you would be the first victims. Its first magistrate cannot, if he would, avoid the performance of his duty. . . .
Andrew Jackson Proclamation to the People of South Carolina 1832.
If you read all of the proclamation and then read Lincoln’s first inaugural it certainly appears he drew from it. Though he used much softer language.
So I don't consider him to be much in the way of a constitutional scholar, and in any case, the right to independence is from a higher law than the US constitution which is mere man created law, and that only because the Declaration of Independence gave the newly independent nation the authority to create the constitution.