"I do not think it is very part of prudent politics for any party to put pre-conditions, particularly on a matter which involves a fiscal relationship between the Centre and the states," Jaitley told reporters here.
He was replying to a question about the three pre-conditions put forth by former Finance Minister P Chidambaram for Congress supporting GST.
"All these three decisions are unanimous decisions of all the states to which the Congress party states are privy. So it is clear that these three pre-conditions are an after thought," Jaitley said.
Due to disruption by opposition Congress, the government could not get the GST Constitution Amendment Bill passed in the Monsoon session of Parliament which ended yesterday.
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Jaitley said the first conditionality of a constitutional cap of 18 per cent on GST rate was not Chidambaram's proposal in the Bill as approved by him after the Standing Committee recommendation in 2013.
Jaitley said the rates would be decided depending on the fiscal position and economic situation, and Constitution need not be amended to alter them.