Najjar joined the Islamic Revolutionary Guard Corps when the body was established in 1979, where he was in charge of the Middle East Department, with Israel, Lebanon and the Persian Gulf as places of particular attention. As an IRGC commander, he served in Lebanon. Previous positions include:
Acting Commander of the Weaponry Support Unit of the Ministry for IRGC Affairs and responsible for equipment and industrial technical assistance in Hadid industries.
Deputy Head of the Armament Section of the Military Industries Organization from 1986 to 2007.
Head of the operational council of the arms industry group in the defense industries organization.
Najjar was posted to the Parliament and ministry of defense by Mahmoud Ahmadinejad in August 2005. 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.
Activities and views
During his tenure as minister of defense, Najjar frequently attacked the West's nuclear abilities and fiercely defended Iran's right to advance its peaceful nuclear energy program. According to his military philosophy, missile capabilities play an important role in the defense of Iran and in its overall military abilities. Najjar believes that "they serve the interests of stability and peace in the region" and are an integral part "…of the power of defense of the Islamic world." According to Najjar, "Iranian missiles are not a threat to any country, and they will only fall on the heads of those who attack Iranian territory." In response to the test of the long-range surface-to-surface Sajil missile, Najjar said it was designed "…for deterrence and to safeguard the stability of the region." Throughout his tenure, Najjar has focused on Iran's military-technological independence and on ensuring the country would not be dependent on the supply of weapons systems from other countries. This was emphasized in his statement upon handing over the reigns of his position to his successor : After assuming the position of interior minister, Najjar gathered all the employees of the ministry, sharing both his worldview and the main tasks of the Ministry: During his term, there were increasingly harsh punishments for dress code violations and morals. The enforcement of the dress code gained significant momentum and dedicated mechanisms and organizations were established to promote enforcement along with measures "…to strengthen the Islamic faith." Throughout his term, he has taken a hard line when it comes to suppressing protests and the opposition in Iran, referring to them as fitna, and saying that they were acting against the best interests of the Iranian people. In the middle of July 2010 demonstrations, he called in Iran's Law Enforcement Forces, warning against a "Velvet Revolution" and "imperialist plots." Najjar warned against activity on social networks and satellite channels: "The West is taking advantage of electronic systems and the virtual world to undermine the security of our society and break down the family unit in Iran. This is a matter which must be thoroughly investigated." There has been an increase in Iran of monitoring of the Internet, arrests of bloggers and blocking of e-mail accounts. At the same time, Najjar responded to the increased activity of the Sunni opposition with a security clampdown on Iran's eastern borders. During his tenure, Najjar had to grapple with the assassination of Iranian nuclear scientists and said that "this issue is our top priority" and that his Ministry had implemented a special program to guard nuclear scientists." The tough and violent approach taken by Najjar during the repression of the protests after the 2009 elections put him and other senior Iranian officials on the U.S. designation for serious human rights abuses involving Iran. The Fact Sheet issued by the U.S. Department of the Treasury stated the following about Najjar:
