US President Donald Trump on Monday said he had imposed a 25% tariff on goods from countries with commercial ties to Iran, a move that could put pressure on Tehran as anti-government protests enter a third week, BBC reported.

Trump said on social media that the tariff was "effective immediately", without offering details of what constituted "doing business" with Iran.

China is Iran's largest trading partners, followed by Iraq, the United Arab Emirates, Turkey and India, according to BBC.