"Our Rashtriya Janata Dal is not in favour of midterm Assembly polls because Bihar has witnessed four government in four years and the state is not ready for fifth," Mr Tejashwi told reporters in Patna.
Mr Tejashwi, former Deputy Chief Minister, said holding the assembly polls time and again put extra burden on people and the RJD did not want any such thing to happen for now.
But, Mr Tejashwi said, the RJD is ready for assembly polls any time. "The RJD is ready to uproot a government that has betrayed its mandate."
He said Nitish Kumar's politics is full of contradictions. "Nitish Kumar has been taking U-turns repeatedly; he is a typical Paltu Ram."
Sensing revolt by Janata Dal United legislators, the chief minister on Sunday assured them that the assembly polls will be held on time in 2020 in Bihar.
"Let there be no confusion. The mandate (for us) is for five years. The term of the Lok Sabha ends in 2019, while the assembly will complete its term in 2020. Polls will be held on time," the chief minister said.
Nitish Kumar said his party supported the idea of simultaneous polls in principle, but the details have to be worked out first.
Get Breaking news, live coverage, and Latest News from India and around the world on NDTV.com. Catch all the Live TV action on NDTV 24x7 and NDTV India. Like us on Facebook or follow us on Twitter and Instagram for latest news and live news updates.