The agency had asked Sisodia for a convenient time and place for an interaction. The AAP leader is understood to have called a CBI team at his residence today, sources said.
The sleuths kept "seeking clarifications" for over six hours at his residence, they said.
The CBI sources said a similar exercise had already been carried out with other people linked to the campaign including Dilip Cherian, the head of well-known public relations company Perfect Relations.
The CBI had registered the PE in January on the basis of a complaint filed by the Vigilance Department of the Delhi government.
The sources said no search or raid was conducted at the premises of Sisodia.
According to rules, no search or raid can be carried out under a PE.
The vigilance plaint had alleged the Delhi government had hired a consultant of Perfect Relations to promote the "Talk to AK" campaign and a proposal of Rs 1.5 crore was prepared for this purpose. AK stands for Delhi Chief Minister Arvind Kejriwal.
The sources said the CBI had registered the PE to probe these allegations and is looking into the alleged role of Sisodia and others.
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