Can I use my Nexus card to enter the U.S. from Canada while my U.S. passport is not in my possession because it's being renewed?
Yes, you can, according to the Customs and Border Patrol information on what documents are needed for US citizens to enter the US:
Land or Sea Travel: U.S. citizens entering the United States by land or sea are required to present a valid WHTI-compliant document, which include:
- U.S. Passports
- U.S. Passport Cards
- Enhanced Driver's Licenses
- Trusted Traveler Cards (Global Entry*, NEXUS, SENTRI, or FAST)
- Military Identification Cards (for members of the U.S. armed forces on official orders)
- U.S. Merchant Mariner Document (for U.S. citizens on official maritime business)
A Nexus membership REQUIRES you to input your passport details, and keep them up to date. During your membership sign up and potential in-person interviews, you were told to be aware of a list of things, this was one of them. One of the other key items on the list was, by having a Nexus card you will not be excluded/immune from undergoing a Customs/Immigration (secondary) examination.
Travelling with a Nexus card while having expired identification tied to it could result in a number of things, such as a secondary inspection. It's important to remember however, it's a computerized system not requiring humans to update it so:
Your card will be flagged for having expired identification.
This has been a frequent question used for the in-person examinations to see if people have been listening/paying attention. It is quite clear from the answers/comments that people are not active Nexus members, nor have they done their research.
From the CBSA website:
Keep your personal information current, such as address and immigration status;
When you travel using your NEXUS membership card, you must possess appropriate immigration documents (e.g. a work permit or a visa). Your authorized period of admission to Canada or the U.S. depends on your valid immigration status for each country or your citizenship of that country.