Sharad Yadav and several rebel leaders attended the convention amid rumblings of a virtual split in the party.
"BJP President Amit Shah appreciated the move and welcomed the decision as he tweeted:" JD (U) द्वारा प्रस्ताव पारित कर NDA में शामिल होने के निर्णय का मैं स्वागत करता हूँ। (It's a welcome move by JDU to join the NDA).
Addressing an open session after the JD (U) national council and national executive meets, Kumar said speaking up after the development was of no importance. "He is one of the founders of the party, therefore, he can put forward his views in the meeting", Tyagi said before JDU's national executive meet.
The Nitish faction sacked Sharad Yadav as its Rajya Sabha leader last week for opposing the party's alliance with the BJP.
The JD (U), which has asked Sharad Yadav not to hold the event, had removed him as its parliamentary party leader in the Rajya Sabha when he continued with his campaign against the alliance with the BJP. Sources close to Sharad Yadav said he is looking beyond Bihar to forge wider opposition unity, and that his home state Madhya Pradesh could be his first stop.
After the JD (U) was reduced to two seats in the 2014 general polls, Nitish teamed up with Lalu Prasad Yadav and the Congress and the alliance made the NDA taste its first big defeat in the 2015 state polls. Yadav's supporters reportedly were on their way to the SK Memorial Hall for the "Jan Adalat" programme, along with the disgruntled leader, when they stopped outside the chief minister's residence and began to shout slogans.
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Some critics accused the government of not learning from past disasters in a city where many poor areas are near sea level and lack good drainage.
The party is likely to get two berths in the Modi ministry despite having only two members in the Lok Sabha.
JD-U spokesperson K.C. Tyagi said on Monday.
Yadav's remarks and action are seen as mutiny against Kumar's leadership and he might be suspended from the party's primary membership if he attends an RJD rally on August 27.
Tyagi also said that there was no split in the JD (U) as all the MLAs supported Nitish Kumar.
"JD (U) president Nitish Kumar approved a resolution to become part of the NDA. I was termed as a Chief Minister due to circumstances. and that I have no political base".