"Arvind Kejriwal levelled all baseless allegations; there was nothing new in it. If he comes with up a new allegation, then we will pay attention to it," he said.
Singh earlier tweeted 'Arvind Kejriwal is like Rakhi Sawant. They both try and expose but with no substance'.
Singh also sought an apology from Rakhi Sawant for making this comparison.
"Apologies to Rakhi Sawant I am an old fan of hers!," he further said in his tweet.
Kejriwal, who parted ways with Anna Hazare, had earlier alleged that the UPA Government-led by Prime Minister Dr. Manmohan Singh has turned out to be the biggest economic threat to India.
On Saturday, Kejriwal had trained his guns on the Congress and the BJP by terming himself deadlier than dengue.
"I am deadlier than dengue, if I will bite the Congress and the BJP, they would face problems," Kejriwal said here.
Kejriwal has so far targeted Congress President Sonia Gandhi's son-in-law Robert Vadra's land deals, the then Law Minister and present External Affairs Minister Salman Khurshid of allegedly misusing funds allotted to his NGO, Bharatiya Janata Party (BJP) President Nitin Gadkari in the Maharashtra irrigation scam and the Mukesh Ambani-led Reliance group.