Indeed, Olmert and his deputy and successor as leader of the Kadima party outgoing Foreign Minister Tzipi Livni never developed any coherent position on Iran at all.
The outgoing officer's first assistant can automatically fill the position for 120 days, at which point (or before) the President must put forth a nominee, or the President can appoint any other officer previously confirmed by the Senate.
Even if his PML-N does not have an outright majority, its projected margin of victory suggests it will be in a much stronger position than the PPP was at the head of the outgoing coalition.
He does not want to be over-dependent on the mood among deputies: although TIM held 120 of the seats in the outgoing assembly, there is no guarantee that it will maintain such a dominant position in the new house.