Two more Congress legislators submitted their resignation to the Karnataka speaker today, worsening the crisis for the state's ruling coalition, even as party troubleshooter DK Shivakumar tried desperately to meet the rebel lawmakers who are camped at a hotel in Mumbai. Since last week, the year-old Congress-JDS coalition government in Karnataka has been fighting for survival. With the resignation of legislators MTB Nagaraj and K Sudhakar today, the number of rebels has gone up to 18.