"BJP wants to silence everyone who goes against it. The party wants to create a monopoly in India," he said.
Reacting to the CBI's charges, he said he took over as the railway minister on May 31, 2004 and all the decisions about handing over of the hotels were taken before that.
"So the government of the day, the Atal Bihari government, must respond to CBI's charges," he said.
The former railway minister was reacting to CBI's searches at 12 locations in Ranchi, Patna, New Delhi and Gurgaon, after registering a corruption case against him and his family members including his son, Deputy Chief Minister of Bihar Tejashwi Yadav.
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Prasad said he would unite the opposition against BJP and go ahead with the Patna rally on August 27.
The CBI alleged that between 2004 and 2014, a conspiracy was hatched in pursuance of which BNR hotels of Indian Railways at Puri and Ranchi were first transferred to the IRCTC and later on for its operations, maintenance and upkeep, it was given on lease to a Patna-based private firm.
Prasad, however, denied the allegation.
"No wrong was done in the tendering. IRCTC was formed in 1999, it started functioning in 2002 when NDA was ruling. The hotels of railway in Delhi, Ranchi, Puri and Howrah were handed over to IRCTC in 2003," the RJD supremo said.