Leader of the Opposition in the Rajya Sabha Ghulam Nabi Azad alleged the decision to invalidate Rs 1000/500 currency notes was leaked in advance to some people, including BJP leaders, and called it probably the "biggest scam".
He, however, added that his party is not for its rollback.
In his concluding remarks at the all-party meeting on the eve of the Winter Session, Modi spoke in support of simultaneous Lok Sabha and state assemblies polls and that there should be state-funding of elections as he asked parties to debate the issue.
"We have launched a crusade against corruption, black money and fake currency, which is also behind cross-border terrorism. All parties should come together on this issue of national interest," he said.
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Parliamentary Affairs Minister Ananth Kumar briefed the reporters about Modi's remarks.
Speaking about simultaneous polls, he said, "A crucial problem is how to make political funding transparent. How to implement state funding of elections. Let all political parties debate it and come to a conclusion. Let's remove the question mark which exists against those in public life.
TMC, SP, BSP, JD(U), RJD and others, are "united" and will remain so.
Any government's move to break the unity will not succeed, he said.
"We are all against black money. The government has completely failed in bringing back black money parked overseas as BJP had promised before the Lok Sabha polls. Demonetisation move was ill-prepared and very hasty, causing economic chaos. People from Kashmir to Kanyakumari are suffering," he said, adding that some have died while standing in queues outside banks.
Alleging that the decision was "leaked" in advance to select people, he said it is a big scam, probably biggest in India.
He also wondered if the move was an economic "surgical strike" to kill the opposition ahead of state assembly polls and to benefit BJP.
Though parties like TMC and AAP have sought rollback of the decision to declare Rs 1000/500 notes invalid, Azad and Mallikarjun Kharge, Congress' leader in the Lok Sabha, insisted that their party is not for it.
Azad insisted that there is no division in opposition ranks and TMC will be "part and parcel" of its joint strategy. JD(U) leader Sharad Yadav said opposition parties were "disturbed and angry" the government had caused massive "inconvenience" to the common man with its unplanned action.
After a long time all opposition parties have come together and it would be in the interest of the country to launch protests at various places either together or separately to disseminate information about the Centre's failures, he said.
During the meeting, BJD leader Bhartruhari Mahtab referred to massive participation of students in board exams in Kashmir, a development welcomed by leaders of various parties with thumping of table.