BJP on Friday demanded defence minister A K Antony's resignation, accusing him of seeking to cover up for three years the alleged scam in the purchase of "sub-standard" Tatra trucks for the Army. Launching a direct attack on the defence minister for inaction in probing the alleged bribery and other irregularities in the Tatra truck deal, BJP's Prakash Javadekar said in the Rajya Sabha that Antony was aware of the matter before estranged Army chief General V K Singh raised it with him in 2010.