The administration was also considering additional sanctions against Iran over human rights concerns related to the protests, said a USA official, who wasn't authorized to discuss the plans publicly and demanded anonymity.
"If authorities do not fight protesters, then they will have peaceful protests", said Rahim Guravand, a 34-year-old construction worker.
State TV had reported that 10 people were killed in protests on Sunday.
"These hard-earned rights will be protected, and infiltrators will not be allowed to sabotage them through violence and destruction". Iran has made billion-dollar airplane orders and resumed selling its crude oil on the global market, but the benefits have yet to trickle down. Today, according to state television, nine people died, bringing the death toll to twenty.
Iran officials announced Monday that they would crack down on protestors and would not permit an "insecure situation to continue in Tehran".
The protests on Tuesday entered on its sixth day.
Pro-regime rallies were due to reach Tehran Friday with authorities seeking to put the past week's unrest to bed, as Washington slapped fresh sanctions on Iran and called for an emergency UN Security Council meeting. Students protested in a third day of demonstrations sparked by anger over Iran's economic problems, videos on social media showed, but were outnumbered by counter-demonstrators. So far, 21 people have been killed in different parts of the country as security forces have launched a crackdown against alleged violent demonstrations, arresting hundreds. The seventh protester was killed in nearby Khomaini Shahr.
It said all three were shot by hunting rifles, which are common in the Iranian countryside.
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The detention figures for other Iranian cities can not be confirmed. But while Iran received billions of dollars as a result of the agreement, much of it went to the powerful Revolutionary Guard and helped pay for Iran's military campaign in Yemen and for Hezbollah's defense of Syria's regime in that country's brutal civil war. Twelve people were killed over the weekend. He also condemned the restriction of mobile access to social-media platforms like Instagram and Telegram.
The US State Department said it is encouraging tech companies to try to keep such sites accessible in Iran. The money was Iranian money that had been frozen by the US following the revolution.
There also are now concerns that some protesters could face the death penalty. The crime carries a maximum sentence of death.
In Tehran, the Iranian capital, 450 protesters have been arrested since demonstrations began, the AP reported.
But it also accused the United States of encouraging the violence.
"The freedoms that are enshrined in the United Nations charter are under attack in Iran".
Ghazanfarabadi also said that some of the dissenters will be tried soon for acting against national security and damaging public property.
Iranian Foreign Minister Mohammad Javad Zarif tweeted back: "Trump has an odd way of showing 'such respect'". "This is about his regime's inability to deliver to its people their basic human rights, prospects of economic opportunity, of political freedom".