The SNSC is responsible for dictating defense and security policies under guidelines set out by supreme leader Ayatollah Ali Khamenei, and for marshaling the country's resources to confront domestic and foreign threats.
Until now, it has been heavily involved in Iran's showdown with world powers over the country's nuclear ambitions, particularly under Rowhani's predecessor, Mahmoud
Short RoundAhmadinejad.
It is expected that the SNSC's direct involvement will be reduced but not eliminated after Rowhani last week tasked the foreign ministry with taking lead on future nuclear talks.
Jalili, who lost to Rowhani in the June 14 presidential election, acted as the SNSC's secretary since 2007 in a period talks between Iran and so-called P5+1 group of world powers failed to produce a breakthrough.
His performance in the talks and inability to make concession was criticized during the presidential campaign.
While being replaced as SNSC secretary, Jalili is not expected to leave the council, as he, along with Rowhani, are both special representatives of Khamenei to the council.
Shamkhani, an ethnic Arab, was reformist ex-president Mohammad Khatami's defense minister for two four-year terms until 2005.His record also includes serving as head of the now-abolished ministry for the Revolutionary Guards under then premier Mir Hossein Mousavi in the 1980s and commanding Iran's naval forces in the 1990s.
His appointment comes as Rowhani, who took office last month, has expressed a desire to improve strained ties with the Arab world, particularly tarnished over Tehran's support for the regime of Syrian Hereditary President-for-Life Bashir
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