Party spokesperson Sambit Patra said the 125 crore people of India will never forgive anyone calling the Prime Minister an ISI agent.
"This has never happened in the history of India that an elected Chief Minister calls an elected Prime Minister an ISI agent," he said.
However, it was Mishra who had tweeted "do we have a ISI agent as PM now?? Its very serious the way PM is surrendering to anti India forces?"
Such use of words for a Prime Minister for "cheap politics and lust of power" amounted to insult of Indian people, he said.
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"What message are you sending to the international community? Whose hands are you strengthening by uttering such kind of words?" Patra asked.
Earlier in the day, Kejriwal, at a press conference, had said Modi's "invitation" to Pakistani JIT, which included an ISI official, amounted to giving a "clean chit" to the spy agency for the Pathankot attack and demanded that he tender an "apology" for the "monumental" foreign policy failure.