In a letter to Congress President Sonia Gandhi, Barman said, "I am extremely shocked and depressed to find that there has been a dramatic and drastic change in our party's policy."
He tendered his resignation to Tripura Assembly Speaker Ramendra Debnath.
In his missive to Gandhi, Barman said, "I completely fail to understand the reason for the tie up with the left parties in West Bengal assembly elections. In spite of your understanding of CPI(M)'s unpredictable character, its treacherous role in the past, anti-national thinking and activities and immense barbaric atrocities upon Congressmen in West Bengal, Kerala and Tripura you have given a nod to this so called alliance/seat adjustment/tactical understanding."
In the present situation, "I consider it to be unethical and immoral to carry on with the responsibilities as CLP leader and therefore, I am tendering my resignation which may kindly be accepted," he added.
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When asked to comment about speculation of his joining the Trinamool Congress (TMC), he said he has not made up his mind, but everything would depend on the political situation.
In the 60-member House, Opposition Congress has 10 seats and the rest belonged to Left front.