Serbian police have used tear gas to clear thousands of protesters trying to blockade the residence of President Aleksandar Vucic in Belgrade, BBC reported.
The protesters - who are demanding greater media freedom and free elections - shouted "Resign!"
But Mr Vucic refused to bow to the pressure, saying: "I am not afraid."
The opposition has been staging largely peaceful rallies for weeks. But tensions escalated on Saturday when crowds stormed the state TV station.
Mr Vucic is a reformed extreme nationalist who now wishes to lead Serbia into the European Union.