Congress leader Digvijaya Singh on Thursday urged Aam Aadmi Party (AAP) chief Arvind Kejriwal to help him in "exposing" BJP leader Nitin Gadkari.

On microblogging website Twitter, Singh tweeted: "Kejriwal instead of doing NAUTANKI should join me in exposing Gadkari. He has also filed a defamation case in the same Court against me."

Kejriwal was arrested on Wednesday after he refused to furnish a bail bond in connection with a criminal defamation complaint filed by BJP leader Nitin Gadkari.

The court had on February 28 summoned Kejriwal as an accused in the criminal defamation complaint observing that statements allegedly made by the AAP leader have the effect of "harming the reputation" of the complainant. The summons was issued against Kejriwal on a complaint in which BJP leader Nitin Gadkari had alleged that he was defamed by Kejriwal, who had included his name in the party's list of "India's most corrupt".