Of the 31 legislators, four are from the Naga People's Front, four from the Nationalist People Party and one independent in the BJP-led coalition headed by N Biren Singh in the assembly.
So far, eight out of the 28 Congress legislators who won in this year's assembly elections, have joined the BJP.
On reports that seven parliamentary secretaries of the coalition government have resigned, Th Bishwajit Singh said, "They have submitted their resignation to the chief minister to take up new assignments as the chairmen of several committees of the state assembly."
There was no misunderstanding among the legislators of the ruling parties, he said. People familiar with the matter said the number of Congress MLAs in the assembly is 20 now.