What is the ‘safe third country’ rule?
The ‘safe third country’ rule applies to some people who make a refugee claim at a border crossing along Canada's land border with the United States. The rule may prevent them from having their claim heard in Canada. It is meant to force refugee claimants who can seek protection in the United States to do so.
This rule does not apply at seaports or, in most cases, at airports. Nor does it apply when a person makes their claim after they are already in Canada.