I am a near daily Canadian border crossing truck owner. I asked the CBP guys that I deal with daily about this supposed “rule”.
1. Each and every officer stated that “we are not the vaccine police” and have zero intentions of enforcing it.
2. No officer in the CBP will prevent ANY American citizen from returning to the USA.
3. This “rule” will apply only for non-resident (Canadian or Mexican) drivers.
Will Canada or Mexico retaliate and make the same requirement? I doubt it. Each time US drivers must cross into Canada, we have to complete an entrance pass electronically on their app (Arrive Can). Canada may be “different”, but they are far less stupid than Biden. They want goods crossing the border.
I am not jabbed, and will not be jabbed. Nearly 50% of all the drivers I know in Canada also refuse the jab.
A huge amount of goods is transferred from Mexican-driven truckers to warehouses in El Paso. I expect very few drivers are "fully vaccinated" and this requirement will greatly delay manufactured goods and parts for sale or use in USA equipment.