"Nitish Kumar is PM material and well qualified for it. You don't need to have a doctorate for it.He is among the select few good and successful chief ministers in the country today. He has successfully governed Bihar," Sinha, the BJP Lok Sabha member from Patna Saheb, told reporters at the Jaiprakash Narayan Airport here.
"Nitish Kumar is well qualified for the PM post," Mr Sinha said. "You don't need to have any doctorate for it. He has successfully governed Bihar."
Sinha said Kumar was among many leaders qualified for the post. "At the end of the day one can become PM only after being chosen by the party and numbers in the elections," he said.
He also said that on the basis of his good personal rapport with Kumar, he would try to build bridges between the NDA and JD(U).
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The chief minister called Sinha, 67, his elder brother.
Sinha, who served as Union cabinet minister in the Atal Bihari Vajpayee-led NDA government, said he was not in favour of the BJP baying for Kumar's blood and calling the break up with JD(U) a betrayal.
"One should not burn all bridges as politics is art of possibility and flexibility," the BJP MP told PTI.
"If we are not together today it does not mean we cannot be together tomorrow also," he said.
Sinha, who has been sulking after being denied a place in new election team of Narendra Modi, also praised Kumar for his development work in the state.