- TDP exits NDA over centre's refusal for special status to Andhra Pradesh
- Last week TDP pulled its two ministers out of the central government
- The TDP has 16 members in the Lok Sabha
Mr Naidu's party will also ask for a no-confidence motion against the government in parliament, deciding against playing second fiddle to rival Jaganmohan Reddy's YSR Congress, which submitted its notice on Thursday.
"I took the decision not for selfish reasons but for the interests of Andhra Pradesh. For four years I made all efforts, went to Delhi 29 times, asked many times. This was the centre's last budget and there was no mention of Andhra Pradesh," Chief Minister Chandrababu Naidu said in the Andhra assembly.
Later, in the assembly, Mr Naidu directly blamed PM Modi, saying "He is responsible for injustice to Andhra Pradesh."
"Far from being a threat, TDP's exit is a timely opportunity for the BJP to grow in Andhra Pradesh," said the BJP's GVL Narasimha Rao, declaring that his party would replicate its Tripura success in Andhra Pradesh, where elections will be held next year.
Last week, the TDP pulled its two ministers out of the central government but had stopped short of walking out of the alliance. Mr Naidu had said he tried to reach out to PM Modi but he "did not come on the line". But he left a door open for reconciliation.
Jagan Reddy's no-trust motion, which threatened to eclipse his party, is seen to have accelerated his exit.
The Shiv Sena, another partner which announced separation recently, declared that "the Modi wave is over".
Yesterday, Mr Naidu reportedly told his party leaders that the bypoll results reflected an anti-Modi and anti-BJP wave.
The Chief Minister also said the BJP was trying to use Jagan Reddy and Jana Sena boss Pawan Kalyan against the TDP.
The four-year BJP-TDP alliance crashed as Mr Naidu escalated his campaign for special category status to Andhra Pradesh as promised after Telangana was carved out of it in 2014. Special status would mean a large infusion of central funds to help with the state government's plans to develop its new capital Amaravati.