Unless by some luck the Embassy can/will process a new Visa for the new passports today there is no way they can travel. I hold little hope can happen - especially with the shutdown as only American citizens will be assisted as visa services for non-Americans are not a matter of national security. All round bad timing. Hopefully the airline will be sympathetic to the situation and let you cancel/postpone without too much of a penalty.

Edit to add that Vancouver has pre-clearance so as MSP notes below CBP at the airport could admit them.