Thousands of protesters marched in Buenos Aires against President Mauricio Macri’s austerity program. Among those airing their grievances were teachers, social groups, and leftist organizations. Meanwhile, legislators were gathered inside discussing the budget, which must pass in order to keep Macri’s plan on track.

A few protesters threw rocks and trash at the heavily-armored riot police, who returned fire with rubber bullets and tear gas canisters. When some of those gas canisters were thrown back at police, a wave of motorcycle cops arrived to subdue the rebellion and water cannons were turned against the protesters.

The disorder outside mirrored disorder within the capitol building, where lawmakers could be heard arguing loudly over points in the budget. Macri’s party has a tenuous grasp on power, lacking a majority in either house of Congress, and has made concessions to some provincial governments to secure the votes required to pass the bill.