Allegedly confirmed three times, but anyway, from here
GOP leaders told Bush that his hardcore push to renew the more onerous provisions of the act could further alienate conservatives still mad at the President from his botched attempt to nominate White House Counsel Harriet Miers to the Supreme Court.
“I don’t give a goddamn,” Bush retorted. “I’m the President and the Commander-in-Chief. Do it my way.”
“Mr. President,” one aide in the meeting said. “There is a valid case that the provisions in this law undermine the Constitution.”
“Stop throwing the Constitution in my face,” Bush screamed back. “It’s just a goddamned piece of paper!”
[the reporter has] talked to three people present for the meeting that day and they all confirm that the President of the United States called the Constitution “a goddamned piece of paper.”
I've looked around the "liberal" and "conservative" blogs, and so far, the reporter has a very good reputation on both sides.