He also said that BJP in Bihar is controlled by two-three people only.
Rai, a BJP legislator, told media persons here that he was still in the Bharatiya Janata Party (BJP) and will reveal his future course of action Thursday.
"I am sad and pained by the way new entrants have been given more importance in BJP in place of committed leaders and workers. It caused resentment in the party," Rai said.
He added that he has written a letter to BJP president Rajnath Singh to express his "displeasure on the issue".
Rai is likely to resign from the BJP Thursday if the party central leadership fails to intervene after he raised the issues, a BJP leader close to him said.