The fast will be held after September 9, AP Minister S Sailajanath convener of United Andhra Pradesh MLAs and MLCs Forum told reporters.
He was speaking after the conclusion of a protest organised by the Seemandhra Congress legislators in the Legislative Assembly premises here.
Ruling Congress MLAs, MLCs and AP ministers from coastal Andhra and Rayalaseema regions today organised a protest in the Assembly premises here in support of united Andhra Pradesh.
About 15 ministers, more than 40 MLAs and 15 MLCs participated in the three-hour protest organised by the United Andhra Pradesh Congress MLAs and MLCs Forum.
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The Congress legislators from the Seemandhra region had earlier organised a protest in the Parliament premises.
The Congress party's endorsement of separate Telangana demand on July 30 triggered a wave of protests across Seemandhra which is continuing till date.
During the protests, the Congress leaders noted that a "spontaneous movement erupted like a volcano" in Andhra-Rayalaseema region against state bifurcation.
He demanded that the TDP withdraw its resolution favouring creation of Telangana and write a fresh letter to the Centre seeking united Andhra Pradesh. "This will strengthen our fight for a united state," he said.
He also lashed out at YSR Congress over its topsy-turvy stand on the statehood issue.
He was highly critical of opposition parties saying they were interested only in political gains.