This is just a thought on my part to see what the collective wisdom thinks.

I am a Nexus nember who is also a Global Entry member. When I applied for Nexus I listed my passport card and my passport on the application. Now when I applied for Global Entry everything was transfered over from my Nexus application. With that being said next time I step up to the Global Entry machine would I be able to insert my passport card and have it recongize me? ((I will be carrying my passport))

Again I am just asking to see what everyone thinks.