"I will join the Telugu Desam Party tomorrow after resigning from YSRC," Mohan Reddy told mediapersons in Kurnool.
Jagan had recently announced that he would launch an agitation in Kurnool on May 16 against the irrigation projects being "illegally built" by the neighbouring Telangana on the Krishna and Godavari rivers.
Mohan today claimed that he was not even informed about the agitation and was "pained" by this.