US President Donald Trump on Monday announced countries doing business with Iran will face a 25% tariff on "any and all business being done with the United States of America."

"Effective immediately, any Country doing business with the Islamic Republic of Iran will pay a Tariff of 25% on any and all business being done with the United States of America. This Order is final and conclusive," Trump wrote on his social media platform.

China, Brazil, Turkey and Russia are among economies that do business with Tehran.

The US president's announcement comes in response to reports about the Iranian government having brutally cracked down on protesters calling for an end to the clerical regime.

Iran's supreme leader, Ayatollah Ali Khamenei, has taken a hard line against protesters, saying last week that demonstrators were "ruining their own streets to make the president of another country happy," referring to Trump.

Iran's Foreign Ministry spokesperson earlier Monday said that a channel of communication "remains opens" between Iranian Foreign Minister Abbas Araghchi and US Special Envoy Steve Witkoff.

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White House press secretary Karoline Leavitt told reporters on Monday that Trump was considering a wide range of options, including air strikes, but that his first choice was diplomacy.

Protests have widened in Iran, with demonstrators calling for an end to the ruling clergy of the Islamic Republic that was established nearly five decades ago.

Those protests have turned deadly as reports emerge about a violent crackdown by security forces, with Iran Human Rights, an NGO based in Norway, having said it recorded at least 648 deaths so far since anti-government protests began.

Verifying reports and videos emerging out of the country has grown increasingly difficult from abroad since the country has also had no internet for 100 hours now, according to watchdog NetBlocks.

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