A day after formally severing ties with the UPA, Left parties on Thursday attacked the Government for approaching the IAEA Board of Governors without proving its majority in Parliament, dubbing the move as a "shocking betrayal of moral commitment' made to the country. They vowed to make it "politically' impossible for the Government to go ahead with the nuclear deal. With the Government going to the nuclear watchdog despite the External Affairs Minister's earlier assurance that such a move would come only after winning the trust vote in Parliament, the Left also harped on the apparent contradiction to suggest that Pranab Mukherjee and Prime Minister Manmohan Singh were pulling in different directions. "Less than 24 hours after this solemn commitment (made by Mukherjee), the IAEA Secretariat announced that the Government of India had requested them to submit to the Board the text of the safeguards agreement. It is nothing but very shocking betrayal of the moral commitment not only to the Left parties but also to the country and the people,' CPI(M) general secretary Prakash Karat said. Noting that the Left had no reason to doubt the integrity of Mukherjee, who made a public statement on behalf of the Government after consulting the Prime Minister, Karat said the Left would like to know from the Prime Minister on what occurred in Japan when he met US President George W Bush. "What transpired in the meeting of the Prime Minister with President Bush which led to going back on a public pledge. The Prime Minister owes an answer to the people and the country,' he said. CPI general secretary A B Bardhan, however, went a step ahead and said the Government's move had made the position of Mukherjee "untenable'. Asked whether he thought the External Affairs Minister should quit, he said "it was up to his conscience'. Though isolated on the nuclear showdown, the Left leaders vowed to "fight against the nuclear deal' and "make it politically impossible for the Government to go ahead with the agreement'. Karat, however, said that did not mean "political manoeuverings' in Parliament. Karat said the Left parties would study the draft of the safeguards agreement and soon come out with their analysis and stand on the issue. Karat accused the Congress leadership and the Government of spreading lies that the text could not be made public. Three versions came out on the issue from three quarters