Conservatism consists of exactly one proposition, to wit: there must be in-groups whom the law protects but does not bind, alongside out-groups whom the law binds but does not protect.

-Frank Wilhoit “The modern conservative is engaged in one of man's oldest exercises in moral philosophy; that is, the search for a superior moral justification for selfishness.” ― John Kenneth Galbraith

We already do. We've had a common law enforcement sharing agreement if I recall since 9/11.

Big tax cash cow here in Canada, that's for sure.

There's no way out. USA is responsible for their own borders. Canada as a matter of fact has reciprocal agreements with USA law enforcement organizations.