Taking to Twitter, he posted: "Nitish Kumar what a fall for you to lie about how and why you made me join JDU!! Poor attempt on your part to try and make my colour same as yours!"
He didn't stop at that. The poll manager went ahead: "And if you are telling the truth who would believe that you still have courage not to listen to someone recommended by Amit Shah?" The reference was to Nitish Kumar's claim that he inducted Kishor into the party on the recommendation of then BJP President Amit Shah.
Kishor also removed any mention of the Janata Dal-United (JD-U) from his Twitter bio, sparking off speculations whether his resignation is the next step.
This comes on a day when the JD-U went into a crucial huddle without Kishor. In fact, Nitish Kumar said: "Rahega to theek, nahi rahega to theek. (If he stays, it's ok. If he goes, it's ok)."
In a stern warning, the Bihar CM said: "Already he works as a strategist for various parties, but I'm making one thing clear... if he wants to remain in the party he will have to adopt the basic structure of the party."
Earlier, another party leader Pavan Verma wrote to Nitish Kumar questioning JDU's alliance with the BJP in Delhi while seeking "moral clarity". Nitish Kumar retorted by saying: "Someone wrote a letter. I replied to it. Someone is tweeting, let him tweet. Anyone can stay as long as they want, leave whenever they want. Ours is a different kind of party."
But now with Kishor and Nitish Kumar both refusing to budge and Bihar election scheduled later this year, many are left questioning, is it the end of the road for the duo?
( With inputs from IANS )