If you're looking to get a new Nexus card you’ll have to wait.
The partial U-S government shutdown has affected all non essential services, so while Canada border Services is carrying out half the NEXUS process, south of the border interviews have been postponed
The CBSA tweeting out that applicants should contact the enrolment centre to confirm their appointment.
Some locations are completing the Canadian portion of the interview.
When the U.S. government shutdown ends, you will need to reschedule your interview with U.S.