There is increasing opposition in intensity just as there is increasing support.
I dug up the exact quote and if we decode it as we have learned to do with Clinton you will see that its true
First, at the time there was a "growing challenge" about the "conduct of the war". The news cycle prior to that day had 24 hour crying that we were bogged down and that our battle plan had failed. So there certainly was a "growing challenge" . Second, the sentence he spoke was two parts, the second part being and also opposition to the war. It can be read many ways. The word "growing" modified the word "challenge" and did not necessarily modify the second sentence. When I first read it, it said to me that there was just opposition, not "growing" opposition. Even so, if the he never clarified what was the opposition. There can be at least two types of opposition. One to the war in general and one to the method of conducting the war. In the context of his statement its most reasonable to me that he was refering to the opposition to the conduct of the war and not the war itself. On that score he was reporting what our own reporter were reporting.