Article 1, Section 7, Clauses 2 and 3
Document 2
Declaration of Independence
4 July 1776--He has refused his Assent to Laws, the most wholesome and necessary for the public good.--He has forbidden his Governors to pass Laws of immediate and pressing importance, unless suspended in their operation till his Assent should be obtained; and when so suspended, he has utterly neglected to attend to them.
The Founders' Constitution
Volume 2, Article 1, Section 7, Clauses 2 and 3, Document 2
http://press-pubs.uchicago.edu/founders/documents/a1_7_2-3s2.html
The University of Chicago Press