Bharatiya Janata Party (BJP) leader Vijender Gupta on Tuesday filed a defamation case against Delhi Chief Minister Arvind Kejriwal and his deputy, Manish Sisodia, for "maligning" his image after they accused him of being part of an alleged "conspiracy" to kill the Aam Aadmi Party (AAP) chief.

Vijender Gupta had also sent legal notices to Arvind Kejriwal and Manish Sisodia a week ago, asking them to apologise.

"I have filed a defamation case in Patiala House court against them [Arvind Kejriwal and Manish Sisodia] as they did not reply to my legal notice," said Vijender Gupta, the leader of the Opposition in Delhi Assembly.

Vijender Gupta has already filed a police complaint against Arvind Kejriwal and Manish Sisodia, alleging that they were tying to "falsely implicate" him in an alleged conspiracy to kill Arvind Kejriwal.

During the Lok Sabha polls, Delhi Chief Minister Arvind Kejriwal had said in an interview to a Punjabi channel that the BJP wanted to get him killed by his own Personal Security Officer (PSO) in the manner in which Indira Gandhi was killed.

Countering the charge, Vijender Gupta had tweeted, "Before the slapgate on May 4 @ArvindKejriwal asked the liaison officer to lift the security cover around his vehicle. The chief minister's instruction is registered in the roznamcha (police diary). The AAP could not receive electoral gain out of it because I exposed this, so out of frustration Kejriwal is saying that his PSO reports to the BJP."

Deputy Chief Minister Manish Sisodia shot back and accused Vijender Gupta of being a part of the conspiracy to kill Arvind Kejriwal.

"BJP is conspiring to get the CM killed. This tweet by @Gupta_vijender has proved that the BJP is getting the daily security plan of the CM and it is hatching a conspiracy to kill the CM on this basis. Vijender Gupta is also a part of this conspiracy," Manish Sisodia said quoting Vijender Gupta's tweet.