Alleging a "financial deal" behind inclusion of former Bahujan Samaj Party minister Babu Singh Kushwaha in BJP, former Uttar Pradesh Chief Minister and Jan Kranti Party patron Kalyan Singh has demanded a CBI probe into the matter. "Joining of Kushwaha against whom there are serious allegations of corruption, which are being probed by CBI in BJP raises suspicion. It seems that there was a financial deal of crores for his inclusion in the BJP... this should be probed by CBI", Mr Singh told reporters today.