Mamata Banerjee has warned the Congress that if it doesn't withdraw the petrol price hike introduced last night, she may have to opt out of the government. Other allies like the NCP and the National Conference want the hike reviewed and the ruling Congress has joined that expression of concern. But PM remains firm, and has defended the hike saying, "The move to decontrol petrol prices is part of the process of the direction in which we should move."