The announcement by Iran's Armed Forces follows the decision on Monday by U.S. President Donald Trump who said that the United States designates Iran's Islamic Revolution Guards Corps (IRGC) as a "foreign terrorist organization".
The semi-official Fars news agency said many MPs wore the dark green uniform of the guard in the chamber in a show of support.
Riyadh welcomed Tuesday Washington's blacklisting of Tehran's elite Revolutionary Guards as a terrorist organization, state media reported.
The US move yesterday was an unprecedented declaration against a foreign government, one that could prompt retaliation and make it harder for Americans to work with allies in the region.
Within hours of the Trump administration's declaration, Iran's Supreme National Security Council responded by designating the U.S. Central Command, also known as CENTCOM, and all its forces as terrorist, and labeling the U.S. a "supporter of terrorism".
The US move to designate IRGC as a terrorist organization has been negatively received by a number of countries. Now, following the new IRGC designation, pro-Iran factions in Iraq may see such statements as acts of aggression by the United States.
Iranian President Hassan Rouhani also defended the corps as protectors of Iran, saying in a televised speech that the United States "holds a grudge" against the Guards who have "sacrificed their lives to protect our people, our revolution".
Going a step further, the hard-line Kayhan newspaper said it gave Iranians "permission" to kill American military personnel and the state-run IRAN daily said that the US label was the "designation of the entire Iranian nation". Cavusoglu added Turkey had itself opposed the Revolutionary Guards' actions in Syria.
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In the immediate aftermath of Trump's announcement, Tehran risibly declared the USA military to be a terrorist entity.
The IRGC has been implicated with terrorist plots against the USA military and funding other known terrorist organizations such as Lebanese Hezbollah.
Rouhani's remarks following a meeting between Iranian Supreme Leader Ayatollah Ali Khamenei and IRGC members and their families, meant as a public display of solidarity with a branch of the Iranian military experts believe the Iranian regime tasks with using terrorist tactics to expand the nation's influence worldwide. But this is the first time America has labeled another nation's military a terrorist group.
Tehran retaliated against Washington's decision by naming the United States Central Command (CENTCOM) as a terrorist organization and the USA government as a sponsor of terrorism.
Although the timing was probably linked to the Israeli elections, the long-term intentions seem to be oriented around the Trump administration's efforts to make it far more challenging for future United States administrations to engage the Islamic Republic diplomatically.
The designation, however, could significantly complicate USA military and diplomatic work, notably in Iraq, where many Shiite militias and Iraqi political parties have close ties to the Guard. Iran's foreign minister wants to include Middle East-based US military forces the country's "terrorist groups" list.
Iran's view of Iraq has changed gradually during the last decade. And in Lebanon, where the Guard has close ties to Hezbollah, which is part of the Lebanese government.