On October 26 Sri Lanka's president Maithripala Sirisena suspended Parliament until November 16 and Ranil Wickremensinghe who had been elected prime minister. Mr Sirisena then handed the job to former two-time president Mahinda Rajapaksa.
The appointment of Rajapaksa, a former president accused of human rights abuses and corruption, drew widespread concern, with critics saying the president did not have the authority to name a new prime minister until the incumbent was defeated in a no-confidence vote.
The surprise moves, which critics denounced as a "coup", drew tens of thousands of protesters to the streets of Colombo on Tuesday.
The prime minister Sri Lankans elected in 2015, Wickremensinghe, insists he has majority support among MPs (his United Nations Party has 124 legislators) and wants Parliament recalled to prove it.
The head of state had lifted the suspension of parliament and scheduled a meeting of the legislature on November 5 amid mounting pressure to end a political crisis. This would allow the parliament to choose between Rajapaksa and Wickremensinghe.