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Nitish Kumar on Wednesday extended his party's support to Kovind.
This was widely seen as a setback to the unity among the state's ruling alliance -- Janata Dal-United, Rashtriya Janata Dal and Congress.
Tejashwi Yadav, the younger son of RJD chief Lalu Prasad, refuted reports of cracks in the alliance. He told the media: "The Grand Alliance will continue in Bihar."
Reacting to RJD leader Raghuvansh Prasad Singh's harsh reaction to the JD-U's support to Kovind, the Deputy Chief Minister said: "The Grand Alliance will not be impacted easily by whatever anybody has to say."
Raghuvansh Prasad Singh is the RJD Vice President and considered close to Lalu Prasad.