Mr Sirisena's supporters had been irked by Speaker Karu Jayasuriya's announcement that he was going to call for a vote in the 225-member house on Wednesday for either party to prove their support.
The government also believes that it may not be the right time to wade into the crisis as Wickremesinghe is likely to approach court against the dissolution and decision to go for polls in January.
"On the 14th there was to be a lot of commotion and unparliamentary activities sponsored by the speaker", Amunugama said, referring to the upcoming parliamentary sitting. The legislator called Sirisena a tyrant.
Wickremesinghe has insisted his firing is unconstitutional.
Wickremesinghe has refused to vacate the official prime minister's residence saying he was the prime minister and had a parliamentary majority.
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Prime Minister Mahinda Rajapaksa has obtained the membership of Sri Lanka Podujana Peramuna (SLPP).
Samaraweera claimed Sirisena "kicked the Constitution in the teeth" when he dissolved Parliament. "The amendment will have been negated if this absurd argument is allowed to succeed".
The Prime Minister received the party membership at his official residence in Wijerama Mawatha from the Chairman of the Sri Lanka Podujana Peramuna, Professor G.L. Peiris. Beijing loaned Sri Lanka billions of dollars for infrastructure projects when Rajapaksa was president between 2005-2015, putting the country deep into debt.
"I have watched over the last two weeks as the executive branch has seized the rights and usurped the powers of members of parliament who were elected to represent the people".
"It's totally unconstitutional", said Harsha de Silva, a member of Wickremesinghe's United National Party and a former minister.
India and Western countries have requested that Sirisena act in line with the constitution while they have raised concerns over Rajapaksa's close ties with China. "We will fight this dictator to the end".
The U.S. State Department tweeted that it is deeply concerned by news that the Sri Lanka Parliament will be dissolved, "further deepening the political crisis".
Farhan Haq, the spokesman for United Nations Secretary General António Guterres, said in a statement that Guterres has underlined the utmost importance of respecting democratic processes and institutions and resolving differences in accordance with the rule of law and due process. "We will be fighting this to ensure that Democracy reigns supreme in the country", the party said on Twitter.