"On the basis of my conversation with a third man who was not a player in the episode, CBI summoned me for interrogation.
"I ask the investigating agency why it does not question the main players and beneficiaries of the horsetrading drama," he said.
Several of them have also been named in the sting CD, he said.
"After all who was the end beneficiary of the horsetrading exercise? I lost 10 MLAs while BJP gained as many," he said, adding, "someone who lost 10 MLAs due to horsetrading is being interrogated whereas those who earned as many are being left out."
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Rawat said he has told CBI his side of the story and submitted to it documents which can serve as evidence of BJP's "active" role in the horsetrading that took place in the state during the peak of the crisis in March.
"The whole world saw BJP leaders taking Congress defectors to Raj Bhawan in a chartered bus and then in a chartered aircraft to a Gurgaon hotel," he said.
Numerous visits were made by BJP central leaders to Dehardun during the one-and-a-half month long crisis, he said.
After all what were they up to?. Isn't it enough reason for CBI to bring the BJP under the ambit of its probe?' he asked.
The Chief MInister said he has been saying all along that he will cooperate with the CBI in its ongoing investigations in the sting CD case. "I am doing exactly that," he said.
In the CD, Rawat was purportedly seen talking to middlemen in a bid to strike a deal with dissident Congress MLAs. Rawat has denied any wrongdoing.
Two days before Rawat was to face vote of confidence on March 28, nine rebel Congress MLAs, led by former chief minister Vijay Bahuguna, had alleged that they were offered bribe by Rawat for support during the floor test in the Uttarakhand Assembly and released a video of the "sting" operation.