Democrat Howard Berman, Chairman of the crucial House Foreign Affairs Committee told US Secretary of State Condoleezza Rice that the deal should be shelved till January next year as there is not enough time for the Congres to study it by September 8 when it is scheduled to meet next.

The Congressional panel will examine the 123 Agreement when it is presented to the Congress for its approval.

"I am a friend of India and a supporter of US-India nuclear cooperation. Yet I find it incomprehensible that the Administration apparently intends to seek or accept an exemption from the Nuclear Suppliers Group (NSG) guidelines for India with few or none of the conditions contained in the Henry J. Hyde Act," Berman said in his letter to Rice which was made public on Wednesday.

While seeking a waiver to the accord from the 45-member NSG later this month, the lawmaker said it must be ensured that exemptions agreed reflect conditions of the Hyde Act.

"An exemption inconsistent with the US law will place American firms at a severe competitive disadvantage and undermine critical US nonproliferation objectives. It will also jeopardise congressional support for nuclear cooperation with India in future," he said.

The administration must be mindful of several key things like the immediate termination of all nuclear commerce by NSG member states if India detonates a nuclear explosive device or if the IAEA determines that India has violated its safeguards commitments, he said.

Last week, the International Atomic Energy Agency (IAEA) approved a safeguards agreement that will allow UN monitors to inspect India's civilian nuclear facilities. The deal must now get the approval of the NSG members and then be ratified by the US Congress to become operational.

Berman insisted that there will have to be a prohibition on transfer of enrichment, reprocessing and heavy water production technology by any NSG member to India, a stipulation that NSG supplier states will not allow India to reprocess nuclear fuel except in a facility that is under permanent and unconditional safeguards.

"All these complex issues should be examined in a serious and detailed fashion and it would be better to shelve the deal till the Congress meet in January 2009," he said, adding there is not enough time to present it to Congress by September 8 when it is scheduled to meet next.

"Even if the India-specific agreement reaches Congress by September 8, it is unlikely that Congress will have sufficient time to fully consider all the issues surrounding the deal, the associated safeguards agreement, and the NSG decision -- and to ascertain their impact on US and global nonproliferation standards," Berman said.

He, however, added he was "concerned about the potential for a significant time gap between an accelerated NSG decision and congressional action on the agreement".