A session of the parliament began here Monday, which is widely considered to be crucial for the fate of Prime Minister Manmohan Singh's alliance government.

India's Prime Minister Manmohan Singh gestures to photographers upon his arrival at the Indian parliament in New Delhi July 22, 2008. (Xinhua/Reuters Photo)

The trust vote, which took place Tuesday at the end of the two-day debate, had been necessitated by the withdrawal of support from the Congress-led UPA government by the Left parties over differences on the India-U.S. nuclear deal.

The Left parties withdrew support on July 8 after the UPA government made it clear that it was going ahead with the deal. After the Left's withdrawal, the UPA government was reduced to a minority in the parliament.

Journalists wait outside the parliamentary building in New Delhi, capital of India, July 22, 2008. India's United Progressive Alliance government won the trust vote in the parliament, parliament speaker Somnath Chatterjee declared Tuesday evening. (Xinhua Photo)

Out of the 541 voting members, the UPA government had to get support from at least 271 parliament members to survive the vote.

Facing the biggest political crisis in over four years, Prime Minister Manmohan Singh asserted Monday that he was confident of winning the trust vote, irrespective of the chaos that existed inside the parliament during the debate.

A policeman stands guard outside the parliamentary building in New Delhi, capital of India, July 22, 2008. (Xinhua Photo)