Article 6, Clause 2
James McClurg to James Madison22 Aug. 1787Documentary History 4:264
I have still some hope that I shall hear from you of ye reinstatement of ye Negative--as it is certainly ye only mean by which the several Legislatures can be restrain'd from disturbing ye order & harmony of ye whole, & ye Governmt. render'd properly national, & one. I should suppose yt some of its former opponents must by this time have seen ye necessity of advocating it, if they wish to support their own principles.
The Founders' Constitution
Volume 4, Article 6, Clause 2, Document 8
The University of Chicago Press
Documentary History of the Constitution of the United States of America, 1786--1870. 5 vols. Washington, D.C.: Department of State, 1901--5.