Tens of thousands have gathered on the streets of Sri Lanka's capital to call for the government to go.
Former President Mahinda Rajapaksa - who suffered a surprise defeat in the presidential election three years ago - is leading the protest.
President Sirisena's government was viewed as an opportunity for a fresh start in the South Asian nation, but the protesters say that it is weak and has failed to fulfil its promises.
Al Jazeera's Wayne Hay reports from Colombo.
