Section 5.
The Congress shall have power to enforce, by appropriate legislation, the provisions of this article.
Regardless of this administrations protests that the debt ceiling impairs their ability to continue borrowing, the debt ceiling law is precisely the "appropriate legislation" inspired by Congress in the words this administration despises.
Of no particular relevance, an article I wrote in late December of 2011 entitled The U.S. Constitution and Civil War has now had far more views than any other at my little blog, 22,054. This month it has had an average of 573 per day.