Trump is right that simmering resentment over the costs of Iran's aggressive foreign policy have led protesters to call for more spending at home and less on support of radical groups overseas.
The protesters have little chance of toppling the clerical leaders, who appear to be retaining control of the military, police and security forces and have no compunction about using them, according to one USA official following the developments.
The protests began Thursday in Mashhad over economic issues and have since expanded to several cities.
That's in contrast to the 2009 Green Movement demonstrations, which protested hard-line President Mahmoud Ahmadinejad's re-election amid widespread allegations of voter fraud.
The demonstrations, which started in the city of Mashhad, were initially against price rises and corruption, but then began to express wider anti-government sentiment.
Popular demonstrations ignited by smoldering resentment about Iran's mismanaged economy has quickly escalated to political denunciations of Tehran's rulers.
The pro-government crowds included women wearing the all-encompassing black chador, the occasional man in military fatigues and Shiite clerics wearing black turbans identifying them as descendants of the Prophet Muhammad.
English-language broadcaster Press TV broadcast yesterday's pro-government rallies live, saying they were to "protest against the violence that has taken place over the last few nights in cities".
US policy should also highlight and denounce the regime's repression and human rights abuses.
He said the "people of Iran are finally acting against the brutal and corrupt Iranian regime".
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In a recent dramatic move, President Trump repeatedly tweeted his support for the actions of the Iranian people.
It was unclear how Iranians viewed Trump's comments, but many are wary of the USA president over his travel ban on Iranians and opposition to the 2015 nuclear deal that lifted worldwide sanctions in exchange for curbing Iran's nuclear program.
He added: "You will see great support from the United States at the appropriate time!"
Mr Rouhani described the USA president as an "enemy of the Iranian nation from the top of his head to his very toes" after Mr Trump said Iranians were "finally getting wise as to how their money and wealth is being stolen and squandered on terrorism".
"Big protests in Iran".
He did not name the enemies but Ali Shamkhani, the secretary of the Supreme National Security Council, said the United States, Britain and Saudi Arabia were behind the riots. Rouhani's office did not mention the comment.
Iran says it temporarily shut down access to both Telegram and the photo-sharing app Instagram to "maintain peace", limiting protesters' ability to share images and publicize rallies.
One showed protesters in Shahinshar, 315 kilometers (200 miles) south of Tehran, throwing objects at a base of the Basij, a volunteer force affiliated with the paramilitary Guard.
The semi-official ILNA news agency reported that the security deputy of Tehran's governor, Mohsen Hamedani, said that the city's provincial security council held a meeting to address the protests, but that its decisions were "classified". Protesters were tearing down the banners of Iran's Supreme leaders, Ruholla Khomeini and Khamenei.The second element that distinguished these protests from others was the surge of protesters pointing to the Iranian regime's vicious foreign policies. After a cut, demonstrators are seen coming to the aid of another protester, who appears seriously wounded.