Will President Bush bomb Iran?
Mr Bush's escalation of the rhetoric was deliberate. A former White House aide said that the reference to a "nuclear holocaust" was a precise attempt to bracket Mr Ahmadinejad's quest for nuclear weapons and stated desire to wipe Israel off the map with Hitler's destruction of the Jews.
"By using that word 'holocaust', Mr Bush has provided a moral reason to allow the Jewish state to do what it needs to do," said the former aide. "He is reinvoking the notion of 'never again'. If you believe that there could be another Holocaust, it becomes morally indefensible to stand back. It is a powerful and loaded term. Those people in Europe who believed that the neo-cons have gone away and shrunk under a rock had better wise up fast."