Hyderabad: Terming the cash-for-votes scandal as the "mother of all scams", senior BJP leader M Venkaiah Naidu on Saturday demanded that a special investigation team be set up to find out who was the beneficiary.

Naidu said former Samajwadi Party leader Amar Singh, recently arrested in the case, was "an event manager" and not the beneficiary.

"It was ridiculous and shameful that BJP MPs, who were (tried to be) lured, showed the money to uphold the dignity of Parliament, but they were victimized," Naidu told reporters here.

"Truth should come out as to what was the source of the money, who carried and transported it and who were the beneficiaries," he said.

The BJP MPs should be felicitated for bringing out the truth before the Parliament, he said.

Alleging that UPA Government was mired in multiple scams, Naidu said senior party leader LK Advani's proposed rath yatra against corruption is for creating awareness and increasing the pressure on the Centre.

Reacting to Congress leader Digvijay Singh's allegation that Naidu and fellow BJP leader Sushma Swaraj had "business ties" with arrested mining baron Gali Janardhan Reddy of Karnataka, Naidu said, "If Digvijay Singh has the courage, let him get an inquiry ordered into it. If he fails (to prove it) he should be sent to mental asylum, as suggested by Anna Hazare."