Najjar was posted to the Parliament and ministry of defense by Mahmoud Ahmadinejad in August 2005.[1] He received 191 to 62 of votes and became minister on 9 August 2005. He was minister until August 2009, when Ahmadinejad was reelected and appointed Mohammad-Najjar as minister of interior. He received 178 to 72 of votes and became minister to succeed Sadegh Mahsouli.