Just hours after opposition strategist David Ndii insulted Deputy President William Ruto on his graduation at the University of Nairobi on Friday, Dennis Itumbi fired back giving Ndii a dose of his own medicine.

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In a social media statement embedded on Dr Ndii's 'insulting' message to the DP,  Itumbi dared him to write a dictionary of insults and publish it on a journal below the belt.

"Congratulations Sir, now write a dictionary of insults. Publish it in the academic journal of below the belt! Godspeed!" Itumbi told Ndii on Twitter.

In his 'bitter' message to the Deputy President Ruto, Dr Ndii in a social media post, had branded him a conman. The economist further told the DP that he was lucky to have "received a credential for his obituary."

"Congratulations conman. When you sleep at night, you will know you have not earned a PhD, just like the rest of your loot. But at least now you have a credential for your obituary," Ndii had Tweeted.

On Friday, Deputy President Ruto graduated with a Doctor of Philosophy degree (PhD) in Plant Ecology from the University of Nairobi (UoN) an achievement that did not well for Dr David Ndii of Nasa movement.