Here are the 10 latest developments in this big story:
Nitish Kumar will take the oath as Chief Minister -- for the eighth time -- and Tejashwi Yadav will be sworn in as Deputy Chief Minister. No other MLA would be sworn in as minister today, it is learnt.
The BJP today held a massive protest in Patna today, accusing Nitish Kumar of betraying the people's mandate. Announcing the plan to hold protests in the districts too, state BJP chief Dr Sanjay Jaiswal said people of Bihar will never forgive Nitish Kumar.
Tarkishore Prasad, who was Deputy Chief Minister in the BJP-Janata Dal (United) government, told NDTV that they had tried their best to ensure that the alliance continued. He added that Union Home Minister Amit Shah had spoken to Nitish Kumar in this connection.
Mr Kumar yesterday said the new ruling coalition will be a "Mahagathbandhan (Grand Alliance) of seven parties". He said the decision to split from the BJP - for the second time in nine years - was based on the feedback he received this morning at an interaction with his party's legislators.
Tejashwi Yadav will serve as Deputy Chief Minister and take oath along with Mr Kumar. "The BJP betrays all its allies and intimidates others," he said at a news briefing with Nitish Kumar.
Switching partners mid-term is an established trait of Nitish Kumar and one that has triggered vast criticism of his ideological flexibility and willingness to trade principles for power. Till 2013, Nitish Kumar was in partnership with the BJP, though it was a fractious collaboration once it became clear that Narendra Modi would emerge as the BJP's main leader. He cut the chord with the BJP and in 2015 formed the government with Lalu Yadav and the Congress. Lalu Yadav, a Bihar veteran politician, is Tejashwi Yadav's father. In 2017, Nitish Kumar stomped out of the three-party alliance, claiming that the insatiable corruption of Tejashwi Yadav as a minister could not be tolerated by him.
After he reunited with the BJP, the parties have exchanged public criticism on issues large and small. In June, Nitish Kumar contradicted the Prime Minister by stating that while the centre had refused to conduct a caste census, in Bihar, the counting of castes would in fact take place. Tejashwi Yadav backed him fully on this move.
Nitish Kumar's anger with the BJP breached the danger mark over reports that Union Home Minister Amit Shah was foraging within the JDU for defectors. The Chief Minister felt that RCP Singh, a senior leader from his party, who had joined the union cabinet, was being used to turn the JDU against him. He therefore refused to extend RCP Singh's term in the Rajya Sabha, which meant that the latter had to resign from PM Modi's cabinet. On the weekend, Nitish Kumar's aides publicly accused RCP Singh of corruption; in protest, he quit the JDU.
Nitish Kumar felt that RCP Singh was part of a second conspiracy by the BJP to attenuate his standing, the first being the BJP's tacit support of another regional leader, Chirag Paswan, to serve as a vote-cutter for Nitish Kumar in the last general election. Chirag Paswan put up his party's candidates against the JDU; it was the BJP who gained. As Nitish Kumar thundered against Chirag Paswan, the BJP refused to criticise him.
Nitish Kumar felt that Amit Shah was attempting a repeat of the Maharashtra model in Bihar and ended the BJP alliance to pre-empt that. Uddhav Thackeray was forced to quit as Chief Minister after Eknath Shinde, a senior leader from his party, the Shiv Sena, instigated a huge revolt in partnership with the BJP. Eknath Shinde was rewarded by the BJP with the post of Maharashtra Chief Minister.
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