TEHRAN (FNA)- Jason Rezaian, an Iranian-American national who is held by Iran for espionage charges, has been imprisoned for his attempts to help the US Senate to advance its regime change plots in Iran, a senior Iranian legislator said citing an IRGC report on Rezaian's case.

"Based on a report by the Islamic Revolution Guards Corps (IRGC) intelligence organization, Jason Rezaian is an Iranian national with US origin and is such an important agent for the Americans that they have made strenuous efforts to free him," Rapporteur of the parliament's National Security and Foreign Policy Commission Nozar Shafiyee told FNA on Sunday.

"Jason Rezaian has had the duty to exercise the thoughts of those people in the US Senate who believe that if the US can revive its pre-Revolution relations with Iran, the Iranian government can be overthrown easily," he added, citing the report.

In late July 2014, Iran confirmed that four journalists, including Washington Post correspondent Jason Rezaian, had been arrested and were being held for questioning.

Rezaian's wife Yeganeh Salehi, a correspondent for the United Arab Emirates-based newspaper, the National, was also arrested at that time, but she and two others were released later.

Judiciary officials have stated on a number of occasions that Rezaian is facing serious charges.

Iranian law does not recognize dual nationality.

According to the Constitution, the Judiciary is independent from the government in Iran.

Last month, some reports in certain western media spoke about a potential prisoner swap between Iran and US but Iran's Judiciary Spokesman Gholamhossein Mohseni Ejei underlined that prisoner swap for Jason Rezaian is not currently on the agenda of the Judiciary.

By Fars News Agency