A break away faction in the Nauru Parliament says a vote of no confidence in the Scotty Government has to be held by Tuesday next week at the latest.
The group of eight rebelled after detailing alleged corruption by the Finance and Foreign minister, David Adeang.
Mr Adeang has dismissed the accusations and called on his opponents to produce evidence.
A spokesman for the rebel group, Mathew Batsiua, says they have credible evidence but President Ludwig Scotty failed to respond to it, prompting the exodus from his administration.
He says the Speaker is legally bound to call Parliament to allow for a vote on their no confidence motion by Tuesday next week, but it is not clear if there will be a resolution of the impasse of the past two weeks.
"It is sort of split down the middle at the moment. We did have a caucus of 15 supporting the Scotty Government when we came in. Eight of us have broken away. We broke away for reasons that we thought the Scotty Government had lost its way."