Article 1, Section 7, Clauses 2 and 3

Every Bill which shall have passed the House of Representatives and the Senate, shall, before it become a Law, be presented to the President of the United States; If he approve he shall sign it, but if not he shall return it, with his Objections to that House in which it shall have originated, who shall enter the Objections at large on their Journal, and proceed to reconsider it. If after such Reconsideration two thirds of that House shall agree to pass the Bill, it shall be sent, together with the Objections, to the other House, by which it shall likewise be reconsidered, and if approved by two thirds of that House, it shall become a Law. But in all such Cases the Votes of both Houses shall be determined by yeas and Nays, and the Names of the Persons voting for and against the Bill shall be entered on the Journal of each House respectively. If any Bill shall not be returned by the President within ten Days (Sunday excepted) after it shall have been presented to him, the Same shall be a Law, in like Manner as if he had signed it, unless the Congress by their Adjournment prevent its Return, in which Case it shall not be a Law.

Every Order, Resolution, or Vote to which the Concurrence of the Senate and House of Representatives may be necessary (except on a question of Adjournment) shall be presented to the President of the United States; and before the Same shall take Effect, shall be approved by him, or being disapproved by him, shall be repassed by two thirds of the Senate and House of Representatives, according to the Rules and Limitations prescribed in the Case of a Bill.

1.William Blackstone, Commentaries 1:149--51, 155, 1765
2.Declaration of Independence, 4 July 1776
3.Edmund Burke, Letter to the Sheriffs of Bristol, 1777
4.Records of the Federal Convention
5.James Wilson, Pennsylvania Ratifying Convention, 1, 4 Dec. 1787
6.Luther Martin, Genuine Information, 1788
7.Federal Farmer, no. 14, 17 Jan. 1788
8.Alexander Hamilton, Federalist, no. 69, 463--64, 14 Mar. 1788
9.Alexander Hamilton, Federalist, no. 73, 494--99, 21 Mar. 1788
10.Impartial Examiner, no. 4, 11 June 1788
11.James Iredell, North Carolina Ratifying Convention, 26 July 1788
12.James Madison, Observations on Jefferson's Draft of a Constitution for Virginia, 15 Oct. 1788
13.Roger Sherman to John Adams, 20 July 1789
14.James Wilson, Comparison of Constitutions, Lectures on Law, 1791
15.James Madison to James K. Tefft, 3 Dec. 1830
16.Joseph Story, Commentaries on the Constitution 2:§§ 878--80, 886--89, 1833