Protest size and comparisons

Violent anti-government protests in Iran have entered a third week, with fears more than 500 people have been killed and thousands more arrested as the regime cracks down on the unrest.

Donald Trump is now weighing-up military options and Tehran has warned of retaliation. 

Today, how seriously Iran's leaders are taking US threats, and why so many Iranians are now calling for the regime to end.

Featured: 

Negin Shiraghaei, British-Iranian activist and founder of the Azadi network

Gregg Carlstrom, Middle East Correspondent for The Economist