The 30-party opposition alliance has claimed to gather two lakh people in the capital on February 28 to give a "big jolt" to the Sushil Koirala-led government.
"If the ruling parties do not halt the process of drafting the constitution through majority voting, then we will intensify our agitation in March," CPN-UM spokesperson Dinanath Sharma told media at the party's central office in the capital today.
He, however, clarified that the protest programmes will be peaceful and within the boundary of the Interim Constitution.
Nepal's ruling and opposition parties are sharply divided on key issues in the Constitution-drafting process including federal structure and forms of governance.
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The opposition alliance, which includes UCPN-Maoist, Joint Madhesi Front and other fringe parties, boycotted the Parliament and took to street to show their reservation after the ruling alliances, including Nepali Congress and CPN-UML, started Constitution drafting process through majority votes.
"Unless the government takes some concrete steps such as halting the process of drafting the constitution through majority votes, we will not come to the dialogue table," said Lilamani Pokharel, politburo member of the UCPN-Maoist.
The new constitution should be drafted taking into consideration the 12-point understanding reached between the Maoist rebels and the seven-party alliances in the past, the Comprehensive Peace Accord and the Interim Constitution, he demanded.