The public inquiry into Indian residential schools is in court in Toronto Thursday hoping to force the federal government to provide the records it wants.
The Truth and Reconciliation Commission says the government has been dragging its feet, making it impossible for it to do its job.
The government says it has done its best to co-operate, providing one-million documents already.
However, there appear to be as many as five million others.
The commission was set up in 2007 as part of an historic settlement with victims of the Indian residential school system.
An Ontario judge is hearing the case over two days.