Bush was bent on invading Iraq and used any cherry picked intelligence he could dig up to justify his pre-ordained goal of democratic nation building. It's already been proven via documents that have come to light recently.
Who is he trying to kid?
I particularly remember Bush announcing that he would not invade Iraq if Saddam allowed unrestricted access to the UN inspection teams. When unrestricted access was granted, Bush changed his ultimatum. He then demanded that Saddam leave Iraq immediately or America would invade. This was before the UN inspection team had time to culminate their work.
Do you call this "diplomacy to the max"?
What he should have said was, "I tried diplomacy, but I didn't inhale."