Mirzapur, Dec 7: Former Uttar Pradesh chief minister Kalyan Singh today attacked Prime Minister Atal Behari Vajpayee saying the latter's concept of `Hindutva' revolved around a particular caste and the backwards were still untouchable for him.``Vajpayee's concept of Hindutva revolves around a particular caste and backwards are still untouchable for him,'' Singh told reporters here.On BJP's reverses in the Lok Sabha polls in the state, the suspended BJP leader said he had opposed giving tickets to some 25 candidates. ``Barring a few, all these candidates, including Vedanti Maharaj from Machhlishahr, lost in the polls," he said.On his likely expulsion from BJP, the former chief minister said a decision to this effect was being delayed as the party did not want him to become a `hero' on December six, the seventh anniversary of the Babri Masjid demolition yesterday.