The resignation of TRS supremo K Chandrasekhar Rao and three of his colleagues -- Vinod Kumar, Ravindra Naik and T Madhusudan Reddy -- would be followed by the resignation of 16 party MLAs and three MLCs from Andhra Pradesh Assembly the next day.

The announcement was made here today by Rao himself at a rally of the party which is spearheading the agitation for separate Telangana state.

Criticising Congress President Sonia Gandhi, Rao charged the party, which fought elections along with the TRS on the issue, with ditching it after coming to power.

Rao also asked other party MLAs and MLCs, especially Congress, to resign their seats if they are committed to Telangana cause.

Rao had stepped down as a Union minister over a year ago and had also resigned his Karimnagar Lok Sabha seat which he later won during the by-poll on the separate statehood plank.

Rao formed the party ahead of the assembly polls and had joined hands with the Congress. The coalition swept the polls.

The protest action by the TRS is coming at a time when Lok Sabha polls are only a year away and the talk is that it could be advanced.