The Samoa Observer reports the two parties had already advertised their intentions to withdraw the election petitions with Tuisa agreeing to resign from office to trigger a by-election.
But when the matter was called on Monday to formalise the withdrawal of the petitions, the court denied the application and set a hearing date for the case.
It will now be heard on July 27th.
Tuisa, who is a lawyer by profession, is accused of six counts of bribery and two counts of influencing voters during polling day.