Out of the total 15 Congress MLAs, nine members led by former Home Minister Tanga Byaling, attended the inaugural session of the Budget Session.
This is for the first time when Congress MLAs from the Nabam Tuki camp attended the Assembly session after Kalikho Pul was sworn in as the chief minister of the state on February 19 after months of political instability in the frontier state.
When Speaker Wangki Lowang initiated the obituary reference, Byaling participating in the discussion, termed the session as "illegal" pointing out that no assembly session could be summoned when the case is pending in the Supreme Court.
Reacting to the move of the opposition, Parliamentary Affairs Minister Wangling Lowangdong said the assembly was functioning as per the provisions of the Constitution and laid down procedures of house.
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"There is nothing illegal as in a democracy majority counts.... The present Peoples' Party of Arunachal (PPA) government is being supported by majority of the members," he added.
With the defection, the Congress in the crisis-hit state was reduced to 15 MLAs with an effective strength of 58 after two Congress MLA resigned.
The BJP which has 11 MLAs in the 60-member House along with two independents members is extending outside support to the Pul government.