The Trinamool Congress has suffered another setback in Parliament after Rajya Sabha MP and Bengali film star Rukmini "Koel" Mallick resigned from the Upper House, adding to a string of high-profile exits that have raised fresh questions over the party's internal cohesion.

Koel Mallick, one of the most recognisable faces in Bengali cinema, had entered the Rajya Sabha only four months ago after being nominated by the Trinamool Congress.

Her resignation comes at a politically sensitive time for the West Bengal party, which is already grappling with signs of unrest among some of its senior leaders.

The latest development follows veteran Trinamool Congress MLA Madan Mitra's decision to join the rebel camp led by Ritabrata Banerjee, a move that has intensified speculation over emerging fault lines within the party.