Patna, April 23 : RJD leader Tej Pratap Yadav on Saturday slammed his party's state unit chief, Jagadanand Singh, for the latter's "mentally unstable" remark directed at Bihar Chief Minister Nitish Kumar. Earlier on Saturday, Singh had sparked a row by claiming that Nitish Kumar is a "mentally unstable person" and it is very difficult to trust him. "There is no vacancy for Nitish Kumar to enter the RJD. There is no place for him in RJD. He is a mentally unstable person and it is very difficult to trust him," Singh said. Singh pointed out that Nitish Kumar recently attended an Iftar party hosted by RJD's Rabri Devi, but that was not a political event. Hence, it would be far-fetched if anyone is reaching to a conclusion that Nitish Kumar could support the RJD to form the government in Bihar, Singh said. "I don't know what was the political motive of Nitish Kumar to visit Rabri Devi's residence for the Iftar party. It seems that he wants to apply pressure on the BJP," Singh said. Reacting to Singh's remarks, Tej Pratap Yadav said, "First we have to ask Jagadanand Singh where he was when every prominent leader of the state was present at the house of my mother Rabri Devi. We were searching for him but he was not found anywhere. Why he stayed away from the Iftar party? As a state president of RJD, we were expecting that he would be there as a host," Tej Pratap said. "CM Nitish Kumar came to the residence of Rabri Devi after we had sent an invitation to him. We are thankful to him that he came. We are thanking the other guests as well. At a time when the deck is almost clear for Tejashwi Yadav to become the chief minister of Bihar, he (Singh) is declaring Nitish Kumar as a mentally unstable person. It was an extremely unfortunate statement," Tej Pratap said. /IANS