"Who says this.... It's all bakwass (useless talk)," Yadav told reporters when asked whether Kumar's name figured in the race.
"Lok Sabha comprises over 540 seats so why are you denigrating the high post. JD(U) is a small party and cannot win a large number of seats to claim the post," he told reporters at Patna airport on way to his Lok Sabha constituency of Madhepura.
Asked about many JD(U) leaders opinion that Nitish Kumar was a PM material, Yadav said, "There was no substance in it."
Some poll surveys have indicated that Nitish Kumar could be a probable for the PM's post if "Third Front" becomes a possibility, in case of UPA and NDA not getting the requisite numbers.
Recently, senior Bihar minister Brishen Patel had said that Nitish Kumar was a perfect candidate for the PM's post.