Kolkata, June 12 -- The Trinamool Congress (TMC) found itself embroiled in a fresh controversy on Friday after a purported letter attributed to party Lok Sabha MP Kakoli Ghosh Dastidar surfaced in the public domain, fuelling intense political debate over issues related to national security and border administration.

The development comes at a time when the former ruling party is already battling reports of internal dissension and factionalism, adding to the political challenges confronting TMC supremo and ex-Chief Minister Mamata Banerjee.

The letter, which has been widely circulated in political circles and sections of the media, reportedly raised concerns about border security in West Bengal and sought scrutiny of certain developments i...