The deal, in which Washington would provide New Delhi unprecedented supply of nuclear fuel and technology, has been stalled due to opposition from the communists who prop up India's federal coalition.

Rice "made it clear that the resolution to the political discussions within India are for the Indian political system to resolve," State Department spokesman Sean McCormack said after the US chief diplomat's call to Foreign Minister Pranab Mukherjee.

She also said that the United States "continue to support moving forward" with the US-India civilian nuclear cooperation agreement, according to McCormack.

He said that both India and the United States were not considering any immediate prospect of renegotiating the agreement.

"I don't believe that there's any consideration of that or any discussion of that on either side at this point," he said, pointing out that India could make or break the deal.

"At this point, I believe it's really a matter for the Indian political system to resolve their questions about it. And whatever that resolution is, it's going be up to them ... whichever way they decide to go," he explained.

The implementing agreement of the nuclear deal was adopted in August after two years of talks and it was heralded as a major shift in ties.

But after a meeting last week with its communist allies, the Indian government indicated it would hold off implementing the deal.

The communists say the pact could harm the country's nuclear weapons program as well as India's non-aligned foreign policy.

Singh appeared to buckle under pressure from the four party Left-bloc after they stood their ground, threatening to topple Singh's government and force early elections if the pact went ahead.

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