"He is the first former CM who has been served summons by the CBI. There is no smoke without a fire. It is another indication that he has done something wrong," state BJP president Ajay Bhatt said.
Accusing Rawat of tainting "Devbhoomi", Bhatt said the former CM should co-operate in the investigations.
The sting CD released by rebel MLAs in Delhi after the political crisis erupted in Uttarakhand in March this year purportedly shows Rawat negotiating a deal to bribe legislators to support him in a floor test.