I know there used to be info on this somewhere, but I can't find it now. I use my passport for primary ID (have lost my backup, for which I don't qualify for anymore anyway). Is there a way to apply for a card while keeping my passport book? Here's what I intend to do: Use the passport book to get the passport card, keeping the book in my possession. Find a period of time when I'm not going to be traveling internationally and apply for the renewal book, using the card as ID for domestic trips. When the book comes, resume my normal travel pattern. Feasible?