According to sources, the opposition leaders will meet in parliament library to work out an effective strategy to take on the Centre when the Monsoon session ends.
An invite has been sent to leaders of opposition parties, including JD(U)'s Sharad Yadav by Leader of Opposition in Rajya Sabha Ghulam Nabi Azad on behalf of the Congress chief.
Besides top Congress leaders, Trinamool Congress chief Mamata Banerjee is also likely to attend the meeting along with other senior leaders like Mayawati, Akhilesh Yadav and Sitaram Yechury, sources said.
Apart from the Congress, Left parties, TMC, RJD, JD(U), NCP, JMM, DMK, NC, SP, BSP, RLD, JD-S, Kerala Congress, AIUDF besides some others are slated to participate in the meeting.
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The 18 opposition parties had earlier decided to meet once a month to discuss various crucial issues and maintain better coordination among themselves to 'unitedly' take on the government.
West Bengal Chief Minister Mamata Banerjee, who arrived here today, met senior Congress leaders Ahmed Patel ahead of the opposition meeting tomorrow.
The Trinamool chief also met President Ram Nath Kovind which was described by her party officials as a "courtesy" call.
Congress leader Ahmed Patel visited the TMC supremo at her South Avenue office to discuss the agenda for the meeting tomorrow, TMC party sources.
This will be Banerjee's second opposition meeting in Delhi. She had attended the opposition meeting ahead of the presidential election last month.