New Delhi, Sep 24 (ANI): Reacting on the reports of the TDP joining the NDA, the central ruling Congress has stated that the alliance does not bother them as they have defeated their alliance before. Congress leader Jagadambika Pal said that the TDP is opportunistic. He also added that the BJP should explain about the alliance as both are principally against each other on the matter of Telangana's separate statehood. As the BJP is leaving no stone unturned to gather new allies before 2014 LS polls, TDP chief Chandra Babu Naidu in a recent meeting with the BJP president Rajnath Singh had raised speculations of a possible tie-up between the two parties.