Iran Special: Did Parliament "Push to Oust Ahmadinejad"?
There are therefore two explanations to the Khamenei intervention on behalf of the President.
1. He wanted to avoid major embarassment for Ahmadinejad, who could have become the first president since the 1980s to be called into question by Parliament for his conduct, and left standing, but smarting and humiliated in front of the nation, which could have ostensibly followed the procedure live.
2. He was wary of the fact that Parliament could have voted a no-confidence motion which would have forced him to either confirm or throw out the impeachment.
It has to be reiterated that the "istizah" procedure of Parliament, to which Ahmadinejad was summoned, does not necessarily lead to impeachment.