Lok Janshakti Party leader Chirag Paswan on Wednesday blamed Janata Dal (United) for engineering the split in his party and rejected the decisions taken by the faction headed by his uncle Pashupati Kumar Paras, saying the party's constitution does not authorise them any such power.

In his first interaction with media after the split in the party, he struck a combative note by describing himself as "sher ka beta" (lion's son) and asserted that he will fight for the cause of the party founded by his father Ram Vilas Paswan.

While blaming the JD(U) for the split, he steered clear of questions regarding the role of the BJP in the development and added that what has happened is also an internal matter for which he will not target others.

It is going to be a long battle, he said, as the group headed by him fights the faction of five other party MPs, led by Paras, to claim ownership of the LJP.

The JD(U), he alleged, had been working to cause a split in the party even when his father was alive.

"A conspiracy was hatched behind my back while I was ill," Paswan claimed.

On Tuesday, Chirag contested Lok Sabha Speaker Om Birla's decision to name Pashupati Kumar Paras as the leader of the party in the House, saying it is "contrary" to provisions of his organisation.

In a letter Paswan had also informed Birla of the party's decision to expel five MPs, who have joined hands against him, and urged the Speaker to review the earlier decision and issue a new circular naming him as the LJP leader in the Lok Sabha.

"Since Article 26 of the Constitution of Lok Jan Shakti Party empower Central Parliamentary Board of the party to decide who would be Leader of our Party in Lok Sabha, hence, the decision of announcing Sh. Pashupati Kumar Paras MP as Leader of LJP party in the Lok Sabha is contrary to provision of Constitution of our party," he wrote.

Paswan's paternal uncle Paras has been elected as their leader by the five of party's six MPs in place of him.

Both factions have now moved to control the party and project their group as the real LJP, founded by Paswan's father Ram Vilas Paswan.

While the wing led by Chirag Paswan has expelled the five MPs from the party, the rival group has removed him as its president.