Papua New Guinea's opposition says it has the numbers and will file a motion of no confidence in the government on Tuesday.
This will be the opposition's fourth attempt to oust the government of prime minister Peter O'Neill, who has been embroiled in a far-reaching corruption scandal for the past two years.
Previous attempts have been struck down because of inconsistencies and for lacking the required number of signatures.
But an opposition spokesperson says he believes this motion meets every requirement and there should be no reason for its passage to be blocked in parliament.
He says this latest motion has been spurred by massive student protests in Papua New Guinea over the past few weeks.
Thousands of students have been boycotting classes demanding that Mr O'Neill stand down over the corruption saga, a demand he has refused to accede to.