Earlier quoted context omitted.
Is this a right you have in Canada? Can't they just be like "yeah, no"?
Unlike in the US, illegal and unadmitted entrants to Canada, the UK, Australia (and probably everywhere else) don't have constitutional protection. So while a Canadian could possibly protest, a non-Canadian really hasn't got a leg to stand on.
No, just like the US:
https://www.aclu.org/other/constitution-100-mile-border-zone