"Only sons of the soil should govern the state and we will be opposing him," Naam Tamizhar party chief Seeman said.
No major political party in Tamil Nadu, including the AIADMK and the DMK, has opposed Rajinikanth's entry into politics on the grounds of his non-Tamil roots.
Shivaji Rao Gaekwad, rechristened Rajinikanth on screen, was born in Karnataka on December 12, 1950.
"There is nothing for him to do here. Sons of the soil are working here based on a constructive action plan," Seeman told reporters here.
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"It is my right to rule my land. I will be a slave if someone else rules... We are not ready to lead a life of slaves."
On the view that it is the democratic right of any Indian to start a political party, he sought to know how such a right was being spoken of only in Tamil Nadu.
Rajinikanth had yesterday announced his much-speculated entry into politics, saying he would launch a party before the next state Assembly polls.
The party would be launched ahead of the state election at "an appropriate time", he told his fans yesterday at the conclusion of a six-day-long photo-session meet.
Rajinikanth's announcement evoked mixed reactions, with the ruling AIADMK and the DMK indicating that the development would not affect them.
Sidelined AIADMK leader T T V Dhinakaran and actors Kamal Hassan and Amitabh Bachchan welcomed his political debut.
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