In the letter, Sisodia wrote, "Today's youth is aspirational, they want to achieve something, and they are looking for opportunities. They want to win over the world. They want to do wonders in science and technology. Does a less educated PM have the capacity to fulfil the aspiration of today's youth?"

Further attacking the Prime Minister, the Aam Aadmi Party (AAP) leader, "In this context, my heart sinks when I hear the Prime Minister saying that we can make tea or food from dirty gas by inserting a pipe in a dirty drain.

"Can food be cooked from the dirty gas of a drain? No. When the PM says that radar can't detect an aircraft flying behind clouds, he becomes a subject of mockery in the entire world. School and college students mock him."

The letter has been shared by Delhi Chief Minister Arvind Kejriwal on Twitter.

Sisodia was arrested on Feb 26 by the Central Bureau of Investigation (CBI) for alleged irregularities in Delhi's new liquor policy. He was also arrested by the Enforcement Directorate (ED).

Kejriwal has recently been fined Rs. 25,000 by a Gujarat court for seeking the details of Prime Minister Modi's educational qualifications or degrees to be precise through the Right to Information (RTI) Act.