Ranjan, who is better known as Pappu Yadav and was against the move to remove Jitan Ram Manjhi as Bihar Chief Minister, said he would send his resignation to the RJD Chief in a few days who can send it to the Speaker if he wants.
Dismissing claim by RJD leaders, including Lalu's son Tejeswi Yadav, that he was in league with BJP, Ranjan said he was not concerned about what some "petty" leaders think and was speaking for RJD workers and senior party leaders who felt hurt at the party's marginalisation.
Such a resignation letter will be more of a political exercise as a member has to submit the papers himself to the Speaker if he wishes to quit.
Attacking Kumar, Ranjan said he has given plum portfolios to leaders who have been working overtime to finish Lalu's career and party and senior RJD leader Abdul Bari Siddiqui also said the party was not consulted by Kumar about his ministry.
Kumar's party JD(U) is being supported by RJD in the Assembly.