AIMIM is an ally of TRS in the upcoming election, and is therefore, an eyesore to the the Congress. With this the Congress is employing another ploy of not attacking the AIMIM directly but by targeting its decision to support the TRS.
The Congress is scared of slamming the AIMIM directly, because the strategy could backfire, making them lose the support of a section of Muslims. This led to a shift in the party election strategy. In the public meetings outside Hyderabad, Congress leaders have said “if you support the TRS it is like supporting the BJP indirectly.” AIMIM is an ally of the TRS so this implies they are also supporting BJP. AIMIM they point out, has not fielded its candidates anywhere else apart from Hyderabad