India's Communist Party leaders say a pending landmark nuclear deal with the United States could have "serious consequences" for India and its government.
The head of India's Communist Party, Prakash Karat, pressed for further discussions before moving ahead with the agreement after he met Saturday with Prime Minister Manmohan Singh, and the head of Mr. Singh's ruling Congress Party, Sonia Gandhi.
The prime minister's office did not immediately comment.
The four-party Left Front Alliance, that shores up India's ruling coalition, called the US nuclear deal "unacceptable.
The communists say the deal will hurt India's sovereignty and independent foreign policy. Mr. Singh has said he does not agree.
The agreement gives India access to US nuclear fuel and equipment in exchange for inspections of its civilian nuclear reactors.