Iranian media said numerous lawmakers wore the uniform of the guard in a show of support for the force.
Iranian leaders have slammed the United States for putting Iran's elite Revolutionary Guard force on a list of foreign terrorist organisations.
Iran's Deputy Foreign Minister Abbas Araghchi, in calling the move on Trump's part "a major strategic mistake", insisted that the new designation by Tehran would include "US military bases and their military forces in the region" and "confronted accordingly".
A number of IRGC and affiliated entities have already been targeted by U.S. sanctions for alleged proliferation activities, support for terrorism and human rights abuses. While IRGC leaders claim their involvement in the economic sector benefits the Iranian people and economy, in reality, it spends most of the revenues on military expenditures at home and overseas.
The decision against the "official army of Iran. was incomprehensible", he said.
The Council of Ministers on Tuesday welcomed the decision of the United States to designate Iran's Revolutionary Guards as a foreign terrorist organization, describing it as a practical and serious step in counterterrorism efforts.
US military officials are reportedly concerned about the possibility of Iranian retaliation against USA interests around the globe, though so far, the responses have been more about sarcasm than violence.More news: Keita and Firmino put Liverpool 2 up
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AIPAC called the IRGC "the principal instrument of the Iranian regime's policy of global terrorism and regional aggression." . The 1983 Beirut bombings that left over 240 U.S. Marines killed in their barracks was carried out by the Lebanese Hezbollah, a terrorist group sponsored, trained and funded by the IRGC from day one.
Iran's rival, Saudi Arabia, welcomed the US decision, describing it as a "serious and practical step to combat terrorism". He quickly forged an alliance with President Trump that has already proved to be of great benefit to Israel.
She said the terrorist organization "controls the lion's share of Iran's economy". It has further isolated this arm, the Islamic Revolutionary Guard Corps, placing it in the same rogues' gallery of designated Foreign Terrorist Organizations as ISIS and al Qaeda.
Iran's Supreme Leader Ayatollah Ali Khamenei rejected the U.S.'s move, saying the Guards had confronted enemies at home and overseas, state TV reported.
China urged countries outside of the Mideast to "promote peace and stability. and avoid actions that may lead to further escalation of the situation".
On Monday the USA secretary of state, Mike Pompeo, said the new designation was meant to isolate Iran and would allow the U.S. to impose further sanctions, diverting financial resources used to fund terrorism and militant activity in the Middle East and beyond.
"We oppose power politics and bullying by any countries", China's Foreign Ministry spokesman Lu Kang said when asked about the USA designation. Just last week, Pompeo's special representative for Iran, Brian Hook, accused Iran and its proxies of being responsible for the death of 608 USA troops in Iraq between 2003 and 2011.
A number of prominent Iraqi political parties maintain close ties to the IRGC, as do many Shiite militias.