I can't speak to the specific measures they would have put in place. What I can tell you is that we've had discussions with the U.S. They shared their concerns, and we're trying to reassure them, first of all, that people need to get an eTA to fly to Canada.
Our officers are trained to discover non-genuine visitors, which occurs daily, and those people either withdraw their request to enter Canada or are sent back. When I ask colleagues at Customs and Border Protection how many instances they have encountered of Mexican nationals who would have flown to Canada and made their way to the U.S. in between border crossings or at a port of entry, the number was very small. That reassured me that the measures we have in place are working as they should be, and our officers are doing a good job.