Originally Posted by
Global guy
The rules are indeed clear. The card may be presented instead of the passport but the passport must be with you.
I had a colleague who needed to attend a meeting in New York (he is Canadian) while his passport was getting a visa renewed and thus was not available.
After checking with the Nexus office etc he was allowed to do it.
The ONLY place he had problems were using the Nexus card as ID with the TSA flying return from JFK to Canada. Eventually, with the help of airline staff, they accepted it, however he almost missed his flight and the airline staff told him he was very lucky.
I wouldn't gamble on this one unless it is absolutely the only answer- and have a backup plan ready.