Lucknow, Dec 30 (ANI): UPCC chief and Congress leader Rita Bahuguna Joshi on Monday slammed former BJP chief Nitin Gadkari for alleging that a deal was brokered between the Congress and the Aam Aadmi Party by a reputed industrialist to stop BJP from coming to power in Delhi. Joshi said if Gadkari is making such statement, he should bring some substantial proof.