Brazilian President Jair Bolsonaro joined supporters protesting against Congress and the Supreme Court in Brasilia on Sunday, stoking concerns of an institutional crisis in the nation that now has the world’s second-highest number of coronavirus cases after the U.S.

In a live broadcast on social media, Bolsonaro greeted fans from a helicopter flying over the area where the demonstration was held. He then landed and joined the protest wearing no mask, despite a local government decree mandating them as a way to prevent COVID-19 spread.

Bolsonaro, a former army captain, also mounted a federal police horse in front of the protesters, who were carrying banners attacking the Supreme Court and even calling for military action against it and the Congress.