"We have never used the word non-negotiable. We felt there is a need for a cap. There is need for ring-fencing it and an absolute guarantee that it will not be tinkered with...
"From what I gather, the Congress President did not use the word non-negotiable, but made it very clear that we would like to have it," Congress deputy leader in Rajya Sabha Anand Sharma told Karan Thapar on India Today TV.
Sharma, a former Union Commerce minister, said the GST Bill will "eventually happen" but refused to give a time-frame when asked whether the measure will become a reality in the ongoing Winter Session of Parliament.
"No, I can't say that. You do not rush through such important Constitutional amendments. We would like to see the amendments in-built with the GST Bill. Where is the GST Bill? It is still work in progress...Why should we rush through. Let's see," he said, insisting that Congress would like to see government's proposal on suggestions made by it on the key reform measure.
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He said "we have to give the country a GST, an effective GST that creates a common market and brings down the transaction cost".
Leader of Opposition in Rajya Sabha Ghulam Nabi Azad told CNN-IBN, "We cannot give a timeline and particular date. The ball is in government's court. It depends on how much they address the concerns of the principal opposition party and other major parties as well."
Maintaining that while he does not see any alternative other than the constitutional amendment for achieving this objective, Azad said that should be the case "unless government comes out with an equally tough amendment".
While Sharma criticised the government for engaging with the opposition on only one issue in the last 18 months, he said that "the doors are not shut" from Congress's side and the party is expecting the ruling dispensation to come out with its proposal on the measure.
"One meeting in 18 months for the passage of just one bill does not bring about a paradigm shift," the Congress leader said, adding that the Prime Minister's "sincerity" will have to be "tested" in the coming weeks and months on the issue of engaging with the opposition.
Holding that the government-opposition engagement cannot be restricted to the passage of just one bill, Sharma said, "Sincerity will be established if he sustains a constructive dialogue with the opposition on all issues, not just GST".