Singh, MLA from Jagdishpur in Bhojpur district, sat on dharna carrying a placard which urged RJD President Lalu Prasad to clarify if the reports doing rounds were true, and if so the reason for it.
"I am only requesting Lalu Prasad to clear the air about me," he told PTI.
He said if he failed to get a satisfactory answer he would start fast unto death tomorrow and commit suicide in front of the party office on Sunday.
Singh hails from Yadav caste and has been very active on farmers issue in the state assembly. Though there was no official word about him, but media reports suggest his past proximity with Janadhikar Party leader and Madhepura MP Pappu Yadav could mar his chance to get a ticket this time.
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Singh, however, denied meeting Pappu Yadav after he was expelled from RJD or indulging in any kind of anti-party activities.
"Many leaders used to meet Pappu Yadav when he was in RJD. Show me any of my statement in his favour after he was expelled from the party or any activity against the party," he added.
He had told mediapersons after RJD central parliamentary board meeting here yesterday that "Its not a free time like in the past when lantern (RJD election symbol) fought on all 243 seats. In the changed context of this elections, the party has got 100 seats on which we have to select candidates.