The resignation of its interim leader, Ana María Calderón, was announced Tuesday amid negotiations between the Honduran government and its sponsor, the Organization of American States (OAS), to extend the mission beyond its January 19 end date.

But even if an agreement is hammered out by the end of the week, there’s no guarantee the Mission to Support the Fight against Corruption and Impunity in Honduras will continue to function.

Any change to the agreement between Honduras and the OAS would require approval by Honduras’ Congress, which in a December vote recommended that the mission be discontinued. It could continue as-is with just an exchange of letters between the government and OAS, but the delay suggests Honduras is trying to get changes.

Honduras President Juan Orlando Hernández invited the OAS to form the group in 2015 as public demands for his resignation arose from revelations that the country’s social security system had been bilked of millions of dollars. The group of international lawyers and investigators set out to strengthen Honduras’ justice institutions and help them carry out investigations of public corruption.

But the mission known by its Spanish initials, Maccih, never had the clout or resources of the U.N.-sponsored effort in neighboring Guatemala that brought three former presidents to trial. Still, it uncovered multiple networks of corruption implicating a number of current and former Honduran lawmakers.

The lawmakers, however, worked to impede its investigations and threw up hurdles to prevent the country’s prosecutors from advancing the cases. They have reduced legal sentences for corruption-related crimes and essentially blocked the Attorney General’s Office from investigating improper use of public funds for up to seven years.