Uttarakhand chief minister Harish Rawat was on Tuesday questioned by CBI in connection with a probe into the sting operation involving him.
Rawat, accompanied by some supporters and an MLA, arrived at the CBI headquarters at 11am.
The CBI had last week rejected the state government's notification withdrawing the nod for probing the case which was given during President's rule.
The Uttarakhand high court also did not stay the CBI probe as requested by Rawat.
CBI had said the notification was rejected after taking legal opinion, which said there was no ground for its withdrawal and it was "not legally tenable".
CBI had registered a preliminary enquiry (PE) on April 29 to probe the "sting operation" purportedly showing Rawat offering bribes to rebel Congress lawmakers to support him during a floor test in the Uttarakhand assembly. PTI