Oh my. Get a grip. It isn't illegal to cross the border into the hands of the RCMP. It is also not illegal to make a refugee claim when you cross. The claim will be processed and they will either be allowed to stay or not on the merits of their case. It's called the rule of law. 

What we need to do is make sure our existing processes are sufficient well staffed and funded so that, when the Bannon administration suspends the Constitution and sends out their goose-stepping, jack booted henchmen, to load women and children onto trains in the middle of the night, our existing institutions are up for the challenge.