Leaders of these parties discussed the broad strategy and issues to be taken up in Parliament during the meeting here on Tuesday, which was primarily convened to discuss the opposition's nominee for the Vice Presidential polls, the sources told PTI while refusing to be identified.
There was a "broad agreement" on five issues over which the 18 parties will target the government inside Parliament as also outside Parliament and through the social media, the sources said.
Referring to the alleged "political vendetta", the sources said there have been cases against Trinamool Congress leaders in "Narada scam" and raids on former Finance Minister P Chidambaram's family as also on the family of RJD chief Lalu Prasad.
Tuesday's meeting was attended by Congress president Sonia Gandhi, vice president Rahul Gandhi, Trinamool Congress leader Derek O'Brien, JD(U)'s Sharad Yadav, NCP's Praful Patel, CPI(M) leader Sitaram Yechury, National Conference leader Omar Abdullah, Samajawadi Party leader Naresh Agrawal, BSP's Satish Mishra as also leaders from 10 other parties.
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O'Brien, who is Trinamool's national secretary and the party's leader in the Rajya Sabha, added that "We are all working as a team" and "There is no question of one-upmanship by an party in the opposition."
In the 545-member Lok Sabha, the Congress has 45 members while Trinamool Congress has 34.
At the meeting, the sources said, Naresh Agrawal of Samajwadi Party suggested that the opposition parties should have such interactions at least once a month to coordinate their positions.
Significantly, these parties displayed unanimity in choosing their candidate for the Vice Presidential polls, the sources said.
The name of Gopal Krishna Gandhi was proposed by O'Brien after Sonia Gandhi asked him to begin deliberations and it was immediately endorsed by all present, the sources said.
There was no second name, they emphasised.
Trinamool was given the first right to propose the joint candidate as it is the second largest opposition party. The largest opposition party, the Congress, had utilised this option in selection of the joint candidate for the Presidential polls, the sources explained.
Significantly, the JD(U), which backed the ruling NDA nominee for the Presidential poll, went with the opposition parties in the context of the Vice Presidential candidate.