Seen here, people gathered in Vijayawada to protest the creation of Telangana.
A parliamentarian from the Congress has decided to take the government- which is led by his party -to court over the decision to divide Andhra Pradesh and turn Telangana, one of its three regions, into India's 29th state.
L Rajagopal said the decision is "unconstitutional" and "undemocratic" and violates the principles of federalism.
"I will move the Supreme Court challenging the Union Cabinet's decision to bifurcate Andhra Pradesh," he told the Press Trust of India.
Like other politicians bitterly opposed to the creation of a Telangana state, Mr Rajagopal belongs to Seemandhra, the 13 districts of Coastal Andhra and Rayalseema that will remain in the state of Andhra Pradesh. Mr Rajagopal represents the constituency of Vijaywada in the Lok Sabha.
Last evening, despite angry protests from some of its own ministers from Seemandhra, the cabinet approved the blueprint for the bifurcation of Andhra Pradesh, where the Congress is in power.
That roadmap or resolution will be sent to the President, who will forward it to the Andhra Pradesh state legislature for feedback. The centre has already made it clear that it will not be obliged to consider the opinions of the state assembly.
In Hyderabad, ministers and state legislators from Seemandhra will meet today at the home of Chief Minister Kiran Kumar Reddy to discuss how they will attempt to fight the centre's decision. The chief minister, who is also from Seemandhra, has repeatedly expressed his opposition to the bifurcation to his party's most senior leaders.