Representatives of WhatsApp, which is owned by Facebook, and the officials of Telecom and Union Home Ministry and Delhi chief secretary were also called by the panel, the notice read.
WhatsApp was represented by Das, who told the panel that it is unlikely to breach the end-to-end encryption of the social media platform from its end, sources said.
Telecom Secretary Anshu Prakash and officials of the Home Ministry also appeared before the panel.
In a letter to the panel's members, Tharoor had earlier said that "Cybersecurity is a major issue on our agenda" and "we are definitely going to take this up under that rubric. And we will be seeking clarifications from the government."
In October, Facebook-owned WhatsApp said Indian journalists and human rights activists were among those globally spied upon by unidentified entities, using an Israeli spyware -- Pegasus.
Facebook owned WhatsApp has over 1.5 billion users globally, of which India accounts for about 400 million.
Meanwhile, the WhatsApp had said it was suing NSO Group, an Israeli surveillance firm, that is reportedly behind the technology that helped unnamed entities hack into phones of roughly 1,400 users.
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