Israeli Prime Minister Benjamin Netanyahu and U.S. Secretary of State Marco Rubio spoke as Israel goes on high alert and Iran faces mounting anti-regime protests.

President Donald Trump said the U.S. may meet Iranian officials and was in contact with the opposition, as he weighed a range of strong responses including military options to escalating unrest posing

US president says Washington is closely monitoring protests in Iran and considering possible military intervention.

The U.S. and Iran traded more threats this weekend, as President Donald Trump once again expressed support for protests challenging Iran's theocracy.

Reports on Sunday indicated that the US was drawing up plans for potential military action after President Donald Trump's threats of an intervention, with a former US army colonel and military analyst claiming that there are signs of a massive military build-up in the Middle-East.

Iran’s parliamentary speaker, Mohammad Bagher Ghalibaf, has issued a stern warning to the United States and Israel, declaring them as “legitimate targets” if the US proceeds with military action against Iran.

As activists say Iran's anti-government unrest has seen almost 120 people killed, the nation's rulers threaten protesters, and U.S. forces across the Mideast.

Demonstrations have spread across Iran in a wave of nationwide unrest over crippling economic conditions. Follow for live updates.