"That's why they see the support of these officials for some rallies in recent days in some Iranian cities as opportunistic", he added.
President Trump also tweeted portions of his address to the United Nations earlier this year, calling out Iran's government for implementing oppressive policies on its own people. He said the Iranian people have proved over the last 40 years that they are resolute in defeating the oppressors of their time.
The elite Revolutionary Guards and its Basij militia, which spearheaded the security crackdown that crushed the protests of 2009, said in a statement carried by state media: "The Iranian nation. will not allow the country to be hurt".
Witnesses said they saw a mass of riot police at the gates of the university while some roads had been blocked off.
Much of the crowds' anger appeared to be focused on a stagnant economy, alleged corruption and Iran's costly involvement in regional conflicts such as those in Syria and Lebanon.
Pointing to the events that followed the 2009 election, Ayatollah Araki said the Iranian nation are experienced and will not let the enemy's threats and plots be repeated.
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In Tehran, some 4,000 people gathered at the Musalla prayer ground in central Tehran for the rally.
The semi-official Fars news agency reported that officials said around 300 protesters gathered in the western city of Kermanshah, the scene of a devastating natural disaster in November that killed over 600 residents.
He also criticized the U.S.'s history of interference in Iran.
Trump initially tweeted his support on Friday night.
Media coverage inside Iran focused nearly exclusively on pro-regime rallies held earlier on Saturday to mark the defeat of the last major protest movement in 2009, which hardliners call "the sedition".
"Counterrevolution groups and foreign media are continuing their organized efforts to misuse the people's economic and livelihood problems and their legitimate demands to provide an opportunity for unlawful gatherings and possibly chaos", state TV said.
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Within Iran's splintered political system, different factions held each other accountable with hard-liners blaming Rouhani and reformists blaming hard-liners.
Video clips have circulated showing protests in Tehran's Towhid square where people were shouting, "Death to Khamenei" and "Referendum, Referendum".
Amir Handjani, a New York-based fellow at the Atlantic Council think tank, said: "Anything the Trump administration says about Iran (even if it may be remotely credible) will be rejected by the vast majority of Iranians, given his position on a whole host of issues that touch on Iranian prestige and national interests".
Iranian authorities warned of potential violence as the street demonstrations, which began over economic conditions, swelled into frustrations with the theocratic rule of Supreme Leader Ayatollah Ali Khamenei.
The Iranian diplomat made the remarks after some USA senators issued statements in reaction to popular protests against some credit institutes in major cities of Iran. Social media footage appeared to show a protester being helped by his comrades after being teargassed.
"When a situation like this occurs the priority of the ruling system becomes the creation of a harsh security atmosphere", he wrote on Instagram.
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Iranian President Hassan Rouhani, whose administration struck the 2015 nuclear deal with world powers, campaigned on freeing the men, though they remain detained. Teheran now sells its oil on the global market and has signed deals for tens of billions of dollars of Western aircraft.