Article Five of the United States Constitution
Article Five gives all of the power for creating Constitutional amendments to the Legislative Branch: the United States Congress and the state legislatures.  The President of the United States cannot amend the Constitution.  He has no part in the process of changing the Constitution.  The United States Supreme Court confirmed this in a 1798 case called Hollingsworth v. Virginia.  In its decision, the Court wrote: "[T]he President ... has nothing to do with the proposition, or adoption, of amendments to the Constitution."  However, the Supreme Court cannot create an amendment either.