Ostensible subcontractor affiliation cannot be protested at GAO because the SBA has exclusive jurisdiction over ostensible subcontractor affiliation challenges.
Source: No Ostensible Subcontractor Protests At GAO – SmallGovCon
SBA Updates All Small Mentor-Protege Template with Affiliation Questions
With little fanfare, the SBA has updated the template for agreements under the All Small Mentor-Protégé