Dehradun, May 08 (ANI): Uttarakhand former chief minister Harish Rawat, who has been summoned by the CBI in connection with a sting CD that allegedly showed some MLAs as well as two bureaucrats being offered bribes, accused the Centre of misusing the investigating agency to tamper the floor test. He added that they will prove their majority, ahead of Uttarakhand floor test on May 10.