COLOMBO, Oct. 28 (Xinhua) -- Sri Lanka's Parliament Speaker, Karu Jayasuriya, on Sunday informed President Maithripala Sirisena that his decision to suspend parliament till Nov. 16 will have "serious and undesirable consequences" for the island country.

In a letter sent to Sirisena, Jayasuriya urged the president to reconsider his decision made on Saturday and informed him that prorogation should be done in consultation with the Speaker.

Sirisena on Friday evening sacked his Prime Minister Ranil Wickremesinghe and appointed former President Mahinda Rajapakse to the post.

The Speaker said that a serious political-constitutional crisis had arisen in the country and called on the president to protect the rights and privileges of Wickremesinghe "until any other person emerges from within Parliament as having secured the confidence of Parliament."

"I request you to consider the said request, as the leader of the Government who has obtained a mandate to secure democracy and good governance," Jayasuriya said.

Wickremesinghe claimed that the move was illegal as he still enjoyed a majority in the nation's 225-member parliament.

Sirisena sacked Wickremesinghe just hours after his United People's Freedom Alliance quit the country's national coalition government.

Wickremesinghe has urged the Speaker to convene parliament immediately so he could prove his majority while his party, the United National Party, said they were discussing the possibility of impeaching the president over his "unconstitutional" move to sack the prime minister.

Rajapakse-led Sri Lanka Podujana Peramuna said a new caretaker cabinet will be sworn in on Monday.

Sirisena, who has remained silent since Friday is expected to address the nation later Sunday.