Kolkata, July 19 -- Trinamool Congress national general secretary Abhishek Banerjee on Saturday challenged the rebel lawmakers who severed ties with the Mamata Banerjee-led camp to return, and offered to resign within an hour if they did. However, senior party leader Kalyan Banerjee threatened to quit party if the rebel leaders returned to the party folds. "Those who left the party and are now abusing or blaming me today. I challenge them to return to Didi. If they do, I will resign from my party post within one hour," Abhishek Banerjee told reporters, while responding to a question on recent spate of defections from the TMC....