Three high-ranking members of Quebec’s anti-corruption task force have resigned.

The head of the Unité permanente anti-corruption Robert Lafrenière denies there are problems within the unit. He said all three are retiring for personal reasons.

But Parti Quebecois leader Pauline Marois questioned whether the departures could cut off access to important information. Opposition critics in the National Assembly also suggested on Tuesday that Lafrenière has failed to get results and should be replaced.

Lafrenière admitted things haven’t been perfect, but said investigations are going well. The unit has more than 200 investigators and a budget of over 30 million dollars a year.