The Solomon Islands Prime Minister Gordon Darcy Lilo says he is confident he has the numbers to withstand a motion of no confidence due to be debated on Friday.
He has also dismissed claims MPs are deserting him to side with the opposition.
Mr Lilohas this week sacked two of his ministers, Snyder Rini and John Moffat Fugui, but Mr Fugui says he quit before his dismissal.
The opposition leader, Derek Sikua, says the leadership spill is gaining momentum.
Mr Lilo has already survived two challenges.