Delhi Congress chief Arvinder Singh Lovely today resigned over alliance with the Aam Aadmi Party (AAP). "The Delhi Congress Unit was against an alliance with a Party which was formed on the sole basis of leveling false, fabricated and malafide corruption charges against the Congress Party. Despite that, the Party made a decision to ally with the AAP in Delhi," he said in his letter to Congress Chief Mallikarjun Kharge.