Over the past 50 years, Iran has been shaken by a series of protests. They began with the demonstrations that led to the founding of the Islamic Republic and continue to now, as protests sparked by the collapse of the Iranian rial have seen unrest.

Tehran also increasingly cut back its cooperation with the International Atomic Energy Agency, the U.N.'s nuclear watchdog, as tensions increased over its nuclear program in recent years. The IAEA’s director-general has warned Iran could build as many as 10 nuclear bombs, should it decide to weaponize its program.

Reza Pahlavi, the exiled son of the last shah of Iran, thanked President Donald Trump for his "support" of Iranian protesters.

President Donald Trump said overnight the United States is "locked and loaded" as he warned Iran not to kill peaceful protesters as nationwide unrest unfolds in Tehran.

Hezbollah condemns U.S. capture of Nicolas Maduro as Secretary of State Marco Rubio vows to end the terrorist group's decades-long presence in Venezuela.

U.S. sanctions on Iran have taken a heavy toll on the country’s economy, contributing to the current protest movement.