Paswan, who thanked Kumar for welcoming the Centre's demonetisation, said that the government in Bihar was "under pressure".
"Any party, be it NDA or UPA, if someone joins, it strengthens the party. Whatever Nitish Kumar wants, it is his prerogative. To take him or not, it is up to the BJP.
"We are allies. I had said Nitish Kumar has welcomed the revolutionary step and I had thanked him. I had also said that he (Kumar) is under pressure in Bihar. And whoever, Lalu Yadav has gone with, has not been spared. That is why, this government (Bihar) will not run for long," Paswan said.
The Union minister had also lauded Kumar for his support to the Centre's demonetisation step, saying he had taken a "bold decision".
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Paswan's Lok Jantantrik Party is part of the ruling NDA coalition at the Centre.
Paswan had claimed that Kumar, whose party JD(U) was a former BJP ally and now a bitter rival, was working "under the pressure of Prasad" who had a "history of weakening his allies".
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