If it was not for the fact that this wicked man may start a global nuclear holocaust I'd say ignore him but we cannot afford to. What is needed is a joint coalition to alter the Iranian situation for long term peace and security. That will involve removing Ahmadinejad from power.
12 Iraqi troops, militiamen killed in multiple ISIS suicide attacks (AP)
from the article: World powers condemn Ahmadinejad for calling Holocaust 'a lie'