Mass protests in the streets of Iran are presenting the most significant challenge to the country’s regime in years. President Trump today renewed his threat to take action in Iran if the government there goes after protestors.

In a letter obtained by Newsweek, Iran's UN envoy said Trump and Netanyahu "encouraged violence" and "supported terrorist groups."

Iran's judiciary chief has vowed decisive punishment for protesters, signaling a coming crackdown against demonstrations.

Get live updates and the latest news as Trump says a second wave of Venezuela attacks won't be needed and says the U.S. will begin attacking drug cartels on land.