Hundreds of thousands of protesters took to the streets in Munich, Germany, on Saturday to rally against Iran’s regime and urge President Donald Trump to intervene militarily.

Protesters congregated in Munich as a security conference featuring top Trump administration officials and European leaders takes place in the city this weekend. The demonstration reportedly drew around 200,000 people, with many waving pre-revolution Iranian flags, holding posters of exiled crown prince Reza Pahlavi, and chanting for regime change.