Central Bureau of Investigation (CBI) summoned ousted Uttarakhand Chief Minister Harish Rawat on Thursday to Delhi for questioning on Monday in a corruption case, officials said.
Summon comes after the CBI on April 29 began probing a videographed "sting operation" allegedly showing Rawat offering bribes to rebel Congress lawmakers to support him during a floor test in the 70-member Uttarakhand house.
He denied allegation and called the video fake after it was released by the rebel Congress MLAs.
Union home ministry sent a CD of the video to the forensics laboratory in Chandigarh to examine its authenticity.
State is without an elected government after Rawat was dismissed following a rebellion in the ruling Congress. Centre imposed President's Rule in the state on March 27.
Rawat has challenged the presidential proclamation and the matter is being heard by the Supreme Court.
Apex court has suggested to the BJP-led central government to let Rawat prove his legislative majority on the floor of the house.
Centre on Wednesday requested for two days to "seriously consider" the suggestion. The case comes for hearing on Friday.