It's just a goddamned piece of paper.

I've found it here:
http://www.capitolhillblue.com/artman/publish/article_7779.shtml
http://www.infowars.net/articles/december2005/121205neocons.htm
http://buildpeace.blogspot.com/2005/12/bush-on-constitution-its-just.html
Of course, one may not believe the source (and, heh, main reason for not believing would be that it wasn't said in 'always honest' mainstream media, which is always a problem with that kind of informations...). BUT, even if he hadn't said that, he clearly thinks that, judging by his actions...