Mr Dinakaran reached the Crime Branch Inter State Cell office at around 2 pm and has been asked by the police to join interrogation at 4 pm today. His personal assistant, on the other hand, has been asked to come at 2 pm.
On Saturday, the AIADMK (Amma) Deputy General Secretary was questioned for seven hours by the Crime Branch.
Nephew of jailed AIADMK chief VK Sasikala, Mr Dinakaran is being questioned in a probe over a deal to allegedly bribe an Election Commission official to get the 'two-leaves' symbol for his faction of the party.
Yesterday, a senior police official said Mr Dinakaran was asked to fill its questionnaire concerning the money trail. He was also questioned over his association with Sukesh Chandrasekar — the middleman who was arrested — and whether he had met any Election Commission official. His call logs, WhatsApp messages and SMSes were also examined.
Mr Dinakaran's lawyers were not allowed to accompany him during the police questioning.
The AIADMK leader is already facing a rebellion back home in Chennai, as his faction of the party has decided that both Mr Dinakaran and his aunt, VK Sasikala, would be evicted from their positions.
Get the latest election news, live updates and election schedule for Lok Sabha Elections 2019 on ndtv.com/elections. Like us on Facebook or follow us on Twitter and Instagram for updates from each of the 543 parliamentary seats for the 2019 Indian general elections.