Jitan Ram Manjhi was sacked as the chief minister of Bihar on Saturday.
The MLAs elected Manjhi's predecessor, Nitish Kumar, as their leader.
The latest development in this regard comes hours after Manjhi called on Nitish at the latter's residence here.
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This move by the Janata Dal (United) takes place following the internal friction within the party, as a defiant Manji had refused to give up the chief minister's post.
Senior JD (U) leaders wanted his predecessor Nitish to lead the party yet again in the run-up to the elections due in the state later this year.
Manjhi, who headed a minority government supported by Lalu Prasad Yadav's Rashtriya Janata Dal (RJD), had earlier declared a meeting called today by JD (U) chief Sharad Yadav as 'illegal'.
Manjhi, who had embarrassed his party on several occasions during his short tenure, had contended that only the chief minister can call a meeting of MLAs
Nitish, who had resigned as chief minister owning responsibility for his party getting only two of Bihar's 40 Lok Sabha seats, had handpicked Manjhi to take his place last year.