N Chandrababu Naidu could quit as Andhra Pradesh Chief Minister if the Telangana Anti-Corruption Bureau files the supplementary FIR naming him as an accused in the sensational cash-for-vote scam. Civil aviation minister PAshok Gajapathi Raju is Naidu’s choice as interim chief minister, according to highly-placed sources.The ACB, sources say, is gearing up to seek court permission on Monday or Tuesday to file the supplementary FIR.On Sunday, Naidu held lengthy meetings with DGP JV Ramudu, the state intelligence chief and other senior officials at his residence - the third such instance in the last week.According to sources, Naidu has informed PM Narendra Modi and BJP president Amit Shah that Ashok Gajapathi Raju is a suitable replacement in the event of his resignation.Naidu’s brotherin-law Nandamuri Balakrishna, senior ministers K Narayana and Y Ramakrishnudu were among the names doing the rounds for the top post, but sources said Naidu has opted for Raju, a loyalist and a capable administrator.Sources said that along with Naidu, a central minister and two TDP MPs would be named as accused in the supplementary FIR. The Telangana ACB had already made TDP Telangana MLA A Revanth Reddy the prime accused and arrested him along with two others on May 31.Reddy was caught by the ACB offering Rs 50 lakh as advance for a total Rs 5 crore to Telangana’s nominated MLA Elvis Stephenson to vote for the TDP candidate in the MLC election on June 1.Telugu Desam Party spokesperson Gali Muddukrishnama Naidu ruled out the need for an alternative arrangement in case of the Telangana ACB filing an FIR against the chief minister.“There is no need for us to think of an alternative,” said Naidu. “Basically, the question of filing an FIR by the Telangana ACB against Chandrababu Naidu does not arise as the offence is related to election and only the Election Commission has jurisdiction over it. Secondly, the police in Hyderabad as joint capital of Andhra Pradesh and Telangana fall under the control of the Governor of the two states but not under the Telangana government. Thirdly, the Telangana government committed an offence by tapping the phones of the AP chief minister and other important functionaries working from a joint capital where both the states have an equal say for 10 years till AP moves to its own capital. If the ACB adamantly goes ahead to implicate Naidu in the supplementary FIR, there are courts, there is the Centre and there is the President of India to come to the protection of the Constitution.”Government spokesperson Parakala Prabhakar termed the speculation about Naidu quitting and making Ashok Gajapathi Raju the chief minister in case an FIR is registered against him as “cheap imagination”. “We have no comments to give on this,” he said.*This report was updated on June 16 to include the TDP spokesperson's comments.