Patna, July 27 (IANS): A case was filed against Prime Minister Narendra Modi in a court in Bihar's Muzaffarpur district on Monday for questioning the "DNA" of Chief Minister Nitish Kumar, a lawyer said.

A Janata Dal-United leader filed the case in the chief judicial magistrate's court.

In his petition, the leader said Modi not only insulted Nitish Kumar but also 11 crore people of Bihar by saying there was some problem with the chief minister's "DNA".

The petitioner requested the court to order a first information report against Modi.

Addressing a public meeting in Muzaffarpur, about 70 km from Patna, Modi on Saturday said: "There seems to be some problem in his DNA because the DNA of democracy is not like that. In a democracy, you give respect even to your political rivals."

Nitish Kumar replied at a press meet: "I am a Bihari and Modi has insulted and humiliated all Biharis by questioning my DNA and using such language."