The Prime Minister's determination to "stay the course" and implement politically-risky reforms has hurtled his government into a minority.
Here are the top 10 developments in the political landscape:
Trinamool Congress leader Mamata Banerjee's six ministers are at the Prime Minister's residence to give him their resignation letters. They will then meet President Pranab Mukherjee at 4.30 pm to withdraw their party's support to the government over new policies on opening up the retail sector to foreign companies and increasing the price of diesel. After Ms Banerjee's exit, the UPA will be in a minority.
But the government is not in any imminent danger because it has the external support of Mulayam Singh Yadav and Mayawati, who have 43 MPs between them. Mr Yadav confirmed this morning that he will continue to prop up the UPA. Neither Mayawati nor he participate in the government.
Along with their MPs and the support of smaller players like Lalu Prasad Yadav, the UPA has 310 MPs in its favour. It needs 272 to survive.
With this majority, there is no need for a trust vote, said senior ministers Salman Khurshid and Pawan Kumar Bansal. Parliament is not currently in session.
The PM will explain his economic policies in a TV speech at 8 pm tonight. He is expected to stress the urgent need for other big-bang reforms to revive the sluggish economy. His minister in the PMO, V Narayanasamy said he would "clarify since there was of campaign and misinformation."
Mr Narayanasamy promised that the government would take allies on board before taking crucial decisions and said it would push first with reforms that were less controversial. While Mulayam Singh Yadav has reiterated support, he has said he will continue to protest against the new reforms announced last week. Like the BJP and Ms Banerjee, Mr Yadav and Mayawati are opposed to the government's decision to allow Foreign Direct Investment or FDI in multi-brand retail.
"There is nothing to stop the BJP from seeking a confidence vote," taunted Mr Bansal after Mr Yadav ended days of suspense for the government by announcing that he will remain with the UPA. Mr Yadav said though he is not happy with the government's policies, he is determined to keep the "communal forces" of the BJP at bay. Neither Mr Yadav nor Ms Mayawati wants to make a move that would bring down the UPA and provoke early elections.
Mr Yadav wants time to build support for a Third Front in which he will play a leading role with Left and other parties. Mayawati was crushed in the recent UP elections, and her party was replaced by Mr Yadav's in government. She wants to focus on rebuilding her image and support base.
The main opposition party, the BJP, does not want to call for a trust vote because the Prime Minister will win. The BJP's partner, Sharad Yadav, said today, "We didn't want to bring down the government," adding that the BJP and his Janata Dal United want a special session of Parliament to be called so that the government can explain why it has implemented reforms in retail after earlier promising to seek consensus on the contentious policy.
Ms Banerjee has attacked the UPA for notifying its FDI policies yesterday. On Facebook last night, she posted "Is it ethical, moral and democratic for a minority government to issue government order forcibly and hurriedly when massive protests against it are taking place across the country?"
