In a tweet today, Mr Shah said, he met Mr Kumar yesterday and invited JD (U) to join the NDA. "If this does not work too, there are ways to ensure their ouster from the Rajya Sabha", sources said.
Party spokesperson KC Tyagi also accused Gandhi of "exploiting" the dissidence in the JD (U), saying it is against "political decorum". "This party is not Kumar's alone but also belongs to me", said a seemingly defiant Yadav, a founder-leader of the party, who had merged his original Janata Dal with Kumar's Samata Party, in 2003, to form the JD (U).
These developments are being closely watched and there is speculation about a rift within the JD (U). "This was important due to Yadav's recent actions".
Its leader in the Rajya Sabha Sharad Yadav has rebelled against the alliance with the BJP but apparently does not enjoy much support among other party's lawmakers. If he continues what he is doing, he could face suspension from the party... However, Kumar has been facing heat from Sharad Yadav, his senior colleague and leader of the parliamentary party in the Rajya Sabha.
"The decision to join hands with the BJP and form a government in Bihar was against the mandate given in the 2015 assembly polls".
JD (U) has finally started taking decisions against Sharad Yadav, one of the foundation pillars of the party, who has now turned anti-JD (U). He said Yadav's removal was an "injustice".
He (Yadav) is free to take his decision. We are not going to get cowed down by such threats. But we will not be attending it, "he said". People are with us. "Sarkari JD (U) is with Nitish Kumar, while the original party is with me".
Yadav, who has made public his protest the decision of Kumar, his successor to the party's top post, was addressing a gathering on the second day of his three-day "Samvad Yatra" in Bihar to have a "dialogue with the people".
R.C.P. Singh was first elected to the Rajya Sabha in July 2010.
Speculation swirled over his remarks that the party could suspend him.
India's Bharatiya Janata Party (BJP) chief Amit Shah Saturday invited Chief Minister of the eastern state of Bihar, Nitish Kumar, to join the ruling National Democratic Alliance (NDA).
The Bihar-based party is expected to endorse a proposal to join the NDA in its national executive meeting in Patna on August 19, after which it is likely to join the Narendra Modi cabinet.