I would say Public Service and Procurement Canada is the challenge function. They're the ones who, in this instance, we saw push back when the Canada Border Services Agency said it was going to do a sole source. PSPC asked why they wouldn't do a competitive process, try to run a shorter one. Ultimately, the department doing the contracting—in this case Canada Border Services Agency—has the final decision. They decided at the start to do a non-competitive contract.
The challenge function comes from PSPC. The internal procurement branch is there to help ensure that policies are followed and controls are in place when it comes to contracting.