The back-channel talks to resolve the ongoing impasse in parliament may hit a wall, a tweet by Trinamul's Derek O'Brien has suggested. The Opposition, he indicated, has no intention of budging from its demand of the revocation of suspension of 12 MPs who were penalized for "unruly behaviour".

Sources said on Friday, Rajya Sabha chairman Venkaiah Naidu had asked the Opposition and the government to meet and back channel talks were on to bring about an understanding on the issue that has stymied the Winter Session since it started on November 29.

The Opposition will meet on Monday to decide on their stance.Today, O'Brien, who is the Trinamul's leader in the Rajya Sabha, tweeted:

O'Brien's tweet also indicated that the Trinamul is ready to collaborate with the Congress on this issue, despite their growing differences. Last week, the Trinamul's absence was noted in the opposition strategy session called by Sonia Gandhi to take the matter forward. Besides the Congress, five opposition parties were at the meeting — Sharad Pawar's Nationalist Congress Party, the DMK, the Shiv Sena, CPM and the National Conference. No reason was cited by either side for Trinamool's absence.

Meanwhile, the Leader of Opposition in the Rajya Sabha Mallikarjuna Kharge has also written to the Parliamentary Affairs Minister over an invitation to four Opposition parties.

"All Opposition parties are united in the protest against the suspension of the 12 MPs. We have been requesting from the evening of November 29 itself that either the Chairman of the Raiya Sabha or the Leader of the House Shri Piyush Goyal call leaders of all Opposition parties for a discussion to break the stalemate. This reasonable request of ours has not been agreed to, further inviting only leaders of four Opposition parties instead of inviting leaders of all Opposition parties is unfair and unfortunate," the senior Congress leader wrote.

Naidu had earlier underscored the need of smooth functioning of the House and asked the Leader of the House and the Leader of Opposition to discuss the issue.

But the opposition has been unrelenting on the issue, which became the big flashpoint in the Winter Session. Neither house has been able to function smoothly, with opposition members holding regular protest meets. Among those suspended are six MPs from the Congress, two each from Trinamul Congress and Shiv Sena, and one each from CPI and CPM.

The government, which had accepted the opposition's point that the MPs' unruly behavior took place in the last session, meaning they cannot be suspended in this session under the Rajya Sabha rules.

"They (however) want the suspended members to apologize one by one in the House but they are not going to do anything of that sort," Congress's Mallikarjun Kharge has said.

In the third week of the Winter Session, the productivity of Rajya Sabha hit a low of 37.60 per cent - pulling down the functionality of the House for the first three weeks to 46.70 per cent. The productivity of Rajya Sabha has been 49.70 per cent and 52.5 per cent for the first and second weeks.