Sources added that if Nitish does not relinquish his membership in the Legislative Council, his membership in the Rajya Sabha will automatically stand terminated.
As no other nomination papers were filed for the post, Nitish was elected unopposed after the withdrawal deadline concluded on Tuesday. He has been re-elected for the 2025-28 term.
Prime Minister Narendra Modi hailed the victory, saying that a new "positive MY (Mahila and Youth) formula" has emerged, in an apparent jibe at the RJD's Muslim-Yadav vote base.
The assembly elections are being carried out after the SIR of electoral rolls, which now has 7.24 crore voters across the state, about 60 lakh less than the size before the exercise was undertaken.