After a trail court has ordered the CBI to examine former Prime Minister Manmohan Singh in connection with the Talabira II coal block allocation to Hindalco in Odisha, BJP State president KV Singh Deo on Wednesday demanded that the CBI also quiz Chief Minister Naveen Patnaik as he had recommended to the PM for allocation of the mine.“The CBI must also quiz Naveen Patnaik, who had written letters to the PM urging him to allot the coal block to Hindalco,” Singh Deo said here at a Press conference.