Well, They kept the camera so tight on President Bush's face I did not see the gesture I was asked about. I am going to keep watching him in future speeches and comment on it when I do.
He did use one emphatic hand to chest gesture in the whole speech. When he said, "I have the power (gesture) given to me by congress to decide...(on the patriot act.) The hand to the chest symbolically showed his power and that power was centered on him, and the hitting motion signaled that he would back up that power with might. You are more likely to see that gesture in old movies were they have a stereotped russion leader emphasing that he is in charge. Hummm.