New Delhi [India], August 21 (ANI): In a virtual meeting of opposition parties convened by Congress interim president Sonia Gandhi on Friday, West Bengal Chief Minister and Trinamool Congress (TMC) supremo Mamata Banerjee floated the idea of forming a core group to formulate strategies to counter Bharatiya Janata Party (BJP) in 2024 Lok Sabha elections and to further strengthen opposition unity, informed Loktantrik Janata Dal (LJD) Chief Sharad Yadav.