My understanding is that through the restricted area identity card, the RAIC, that is issued for workers at Toronto Pearson, that process is what will govern whether or not an employee gets clearance to that area. The information gets sent down to the United States and gets vetted. A comment could come back, but the decision is still made by Canadians as to whether or not a RAIC gets issued so that an employee can work in those spaces. That's my understanding of how it will get operationalized.
On May 29th, 2017. See this statement in context.