Addressing a press conference at his office here tonight, Kumar said he was deeply hurt by the Congress's decision to divide Andhra Pradesh.
"In protest against the party's decision, I have sent my resignation to Congress. Earlier I had quit as MP," he said.
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"I have actively participated in the Andhra Agitation and went to jail and spend some more time in Rajahmundry jail. Now, also I will actively participate in the on-going agitation for the united Andhra pardesh and extended my support as a common man," Kumar added.
The Congress high command failed to take in to account the ongoing agitation in Seemandhra region against the division, he said.