Sharad Yadav said action has been taken against a few leaders of the party "who are standing with me", and leaders close to Nitish Kumar have been threatening other JD-U leaders supporting him.
The decision comes in the wake of Sharad Yadav's misgivings over Nitish Kumar's decision to break away from the Mahagathbandhan and form a government with the Bharatiya Janata Party (BJP) in Bihar. The faction led by the 74-year-old claims to be backed by 14 state units of JD (U), who would pitch for the ouster of Nitish for joining hands with the BJP.
"He [Sharad Yadav] has not been removed from the JD (U), only replaced with RCP Singh [as party leader in the Rajya Sabha]. Any decision on BJP's offer to join the government at the Centre or Nitish Kumar becoming co-chairman of NDA will be taken after we formally join the alliance", he added.
Yadav remained unfazed, asserting that the JD (U) "belonged to him and not just to Kumar".
Tyagi said Sharad Yadav won from Madhepura with the BJP's support in 1999.
He said Mr Yadav had already chosen a path which "leads to the RJD".
At a press conference, he also lashed out at JD (U) rebel Sharad Yadav and RJD chief Lalu Prasad, saying the former was a leader without a base while Prasad was using secularism as a cover to hide his and his family's corruption. The invitation was extended to Bihar Chief Minister Nitish Kumar at a meeting of the two leaders.
Besides the JD (U), Lalu Prasad's Rashtriya Janata Dal (RJD) and the Congress were in the three-party coalition. "He wants to split the party, which is not possible". "Kumar's decision to align with the BJP is unacceptable", Ansari said.
He added that this was not a personal fight against Nitish Kumar but a fight of principles and to save democracy and brotherhood.
Speculation swirled over his remarks that the party could suspend him. We are not going to get cowed down by such threats.
The Bihar-based party is expected to endorse the proposal to join the NDA in its national executive meeting in Patna on 19 August, after which it is likely to join the Narendra Modi cabinet.