Rawat reached the CBI office here around 11.15 a.m. and his questioning began a little later, an official said.

The "sting operation" video showed Rawat offering money to rebel Congress lawmakers to win their support ahead of a March 28 floor test in the 70-member Uttarakhand house. The floor test never happened as the state came under President's Rule a day earlier.

The video was shot by a Noida-based private TV channel, Samachar Plus, and was released on March 26 by nine Congress legislators who had rebelled against Rawat's government.

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