"The safe third country agreement is place specifically to stop the kind of illegal border crossings that are happening in Manitoba and Quebec, any migrant who had their refugee status rejected by the US should be sent back to the US immediately."

ChuckT: The problem is that the agreement has a loophole almost as broad as the border along the 49th parallel in the three prairie provinces. Can the loophole be closed? Probably not as long as Trump is in power. He doesn't want these migrants reentering his country. Uncontrolled border jumping from the U.S. will be Canada's problem to solve. Unless we want to build a wall, it appears likely that we'll have to seriously tighten our own laws regarding new claimants, perhaps to the extent of deeming most of those who've lost or abandoned claims in "safe" third countries to be categorically ineligible to file claims for permanent status in Canada. If Trudeau doesn't do something, this could easily backfire on him in the next federal election.