CBI sources said he has been asked to come tomorrow in connection with the inquiry.
Sources in the agency had claimed after his first round of question that Rawat could not "furnish full and complete details" on many issues for which he has been called again. Rawat had countered it saying he fully cooperated with CBI.
The sources, however, failed to elaborate on what specific points Rawat did not furnish details.
"I need not produce any evidence. I have neither done any horse trading nor given any money to anyone. I never said I want MLAs. People of electronic media reach anywhere. I accorded that journalist respect and he blackmailed me. Media needs to ponder over this," he said.
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The agency has registered a preliminary enquiry in connection with the alleged sting operation on April 29 purportedly showing Rawat offering bribes to rebel Congress lawmakers to support him during a floor test in the Uttarakhand Assembly.
The PE is the first step during which the agency verifies the facts in the complaint received by it. During a PE, the agency can only "request" a person "to join the probe" and cannot summon him, carry out searches or make any arrests.
If verification of facts shows need of further probe, it may register an FIR or else close the PE.