The TMC on Tuesday accused the Congress of breaching trust, referring to senior leader Jairam Ramesh's comments where he lashed out at the Mamata Banerjee-led party over the "poaching" of MLA Bayron Biswas.

The spat between the two parties assumes significance as it comes at a time when efforts are being made to forge a united Opposition to take on the BJP in the 2024 Lok Sabha elections.

"'Despite Mamata Banerjee's support Congress vows to fight Mamata Banerjee in Bengal' Statement from Congress two weeks ago. Congress breaches trust on Opposition unity and then expects bouquets of roses! And about strengthening BJP? Grow up," TMC MP Derek O' Brien said in a tweet, attaching Ramesh's post in the comments.

Bayron Biswas, the Congress' lone MLA in the West Bengal Assembly, crossed over to the ruling TMC on Monday, joining the party in the presence of Abhishek Banerjee.

Abhishek Banerjee is the TMC general secretary and West Bengal Chief Minister Mamata Banerjee's nephew.

Earlier in the day, Ramesh said, "Three months after he was elected as a Congress MLA in a historic victory, Bayron Biswas has been lured away by the TMC in West Bengal."

This is a complete betrayal of the mandate of the people of the Sagardighi Assembly constituency, Ramesh, the Congress' general secretary Ramesh, said on Twitter.

"Such poaching which has happened earlier in Goa, Meghalaya, Tripura and other states is not designed to strengthen Opposition unity and only serves the BJP's objectives," he said.

(With inputs from agencies)