It also demanded 12 seats for itself in the alliance.
"We have been ignored. We were not even consulted before the seat distribution was finalised. This is an insult to us and we will not tolerate it," NCP general secretary and Lok Sabha MP from Katihar constituency Tariq Anwar told PTI.
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The JD(U), RJD, Congress and NCP cobbled up the grand alliance with an aim to check BJP-led NDA in Bihar polls.
In a press conference yesterday by Kumar, Prasad and Congress Bihar in-charge C P Joshi, the alliance declared its seat-sharing arrangement for the 243-seater Assembly.
While JD(U) and RJD got 100 seats each, Congress was given 40 and only three were left for NCP to contest.
Anwar said he has informed NCP president Sharad Pawar about the treatment meted out to the party, and that it should get at least 12 seats to contest.
"There could be no rapprochement over the issue if we get less than 12 seats. Seat distribution should be honourable. There should be some basis, some criteria for it instead of taking unilateral decisions," he added.
The NCP general secretary said the demand for 12 seats is on the basis of Lok Sabha poll performance in which it secured 5.6 lakh votes and won the lone parliamentary seat allotted to it in the alliance.
Anwar also pointed out that his party was runner-up in four constituencies, took third position in 13 and was fourth int over 20 places in the 2010 Assembly elections, which it had contested independently.