New Delhi, June 10 -- The Mamata Banerjee-led Trinamool Congress (TMC) camp on Tuesday hit back at the party's rebel Lok Sabha MPs, alleging that they lack "political morality and ethics" and termed them opportunists for trying to engineer a split. Meanwhile, suspense continued over the rebels' strength as there is no clarity on which TMC MPs have joined the other group and officials in Lok Sabha are unsure what is the status of the letter that the rebels have claimed to have submitted. On Monday, TMC MP Kakoli Ghosh Dastidar announced that they had given a letter from 20 MPs to Speaker Om Birla for a separate sitting arrangement in the House. In a press conference, TMC MPs Kalyan Banerjee and Kirti Azad even challenged the rebel MPs to mak...