Congress general secretary Digvijaya Singh on Friday shot off a strongly-worded letter to India Against Corruption (IAC) leader Arvind Kejriwal, calling him a "self-serving ambitious megalomaniac" in which he saw a "streak of Hitler".
"My opinion about you of a well-meaning crusader of public issues has now changed to a self-serving ambitious megalomaniac with scant regard for democracy," he said.
In his response, Kejriwal wrote on Twitter that Singh's letter demonstrated that the Congress was "completely rattled and baffled" apparently with his campaign.
"Digvijaya's letter does not merit a response. Congress seems to be completely rattled and baffled. That's apparent from the letter. Digvijaya seems Congress' last resort," he said.
Hitting out at Kejriwal, Singh said he would also pose questions to him on Saturday but wondered if he would answer or dismiss them all in the manner his "uncomfortable" queries to Sangh, Anna Hazare and Ramdev have been dismissed.
Singh claimed Kejriwal couldn't get along with his "guru" Aruna Roy. "Then you parted ways with Kiran Bedi and now, also with Anna whom you used as a front to give your ambitions a touch of respectability."
He also reiterated his claim that Kejriwal wanted to become a member of Sonia Gandhi-headed National Advisory Council (NAC).
"You wanted to meet her (Sonia Gandhi) and had requested me to propose your name for inclusion in the NAC. I did propose your name but failed. She took Aruna Roy," Singh said.
Gandhi entrusted the task of drafting a strong Lokpal bill to NAC members Aruna Roy and Harshmandar. "I feel this was the time when you made up your mind to upstage NAC by bringing in Hazare and force the government to engage you in drafting the Lokpal bill," Singh said.
Singh also said, "when YP Singh (retd IPS), your former colleague in civil society movement, called you a Hitler, I could see the streak in you".
He also advised Kejriwal to "first practice, then preach".