A 5-judge bench of the Calcutta High Court is hearing today the case related to the bail of four Trinamool congress leaders Firhad Hakim, Madan Mitra, Subrato Mukherjee and Sovan Chatterjee.The matter was referred to larger bench following a split between Acting CJ Rajesh Bindal and Justice Arijeet Banerjee on the grant of interim-bail.Meanwhile, the CBI has approached the Supreme Court against the order allowing house-arrest of the four TMC leaders.