The problem is BJP never opposed the Nuclear agreement(not deal). Avtually they started it. But they have some objections thats why they opposed Congress. They put up their point as well. They are the main opposition party, so they are bound to vote agaist. If they vote for congress, then better merge with it.
BJP Also know that there are only two fronts who will rule the country - BJP Led or Congress Led. So, if the deal is signed it would benefit them too as it was their initiative.
The third frond is meaningless and only seasonal. The parties within it would run to one of the parties - BJP or Congress.
Parliament saw unruly scene during the trust vote due to malpractices done by Congress. They wanted to win the trust vote at any cost. Suspicions were raised about horse trading when the PM excusively met Mukesh Ambani before the trust vote.
