ok..here is the answer. Left has been categorically opposing nuke deal and are also part of the government. Their taking support back means minority government. OK? Now, the BJP is not saying that they are against the nuke deal. They want to bring down government on other issues like inflation. OK? if their is vote on nuke deal, left will vote NO and BJP will vote YES. But before that happens, the problem is that moment government goes for nuke deal, govermnet has to pass the trust vote and then both BJP and LEFT vote NO. Ok? Do you want BJP to vote YES for trust vote or what? thats not possible...they are north and south poles of indian politics. Hope you understand.