The 'Joint Opposition' is threatening to disrupt Parliamentary proceedings if their demand to function as a separate group is not granted by the Speaker, political sources said.

The 'Joint Opposition' has made this request from the Speaker and is yet to receive a response.

The Speaker is expected to announce his decision tomorrow.

The 'Joint Opposition' composes of over 50 UPFA MPs who back former President Mahinda Rajapaksa. The group includes a sizable number of SLFP MPs in Parliament and MPs of several other constituent parties of the UPFA.