But it turns out offering to accept thousands of refugees isn’t so easy. The Guardian reports the immigration system in Canada is being overwhelmed:

As you read over all of that don’t skip the part about the “longstanding pact” that bars refugees from applying for asylum in Canada. It turns out Canada has an agreement with the United States which says refugees must apply for asylum “in the first safe country they arrive in.” In other words, all of the people coming across the U.S. southern border aren’t eligible to claim refugee status in Canada because they entered the U.S. first.

Obviously, if you’re an immigrant traveling north who wants to respond to Trudeau’s #WelcomeToCanada message, you can’t show up at a U.S. border crossing because authorities would know you didn’t arrive in Canada first. And that means Canada can turn you away. Thanks to the first safe country rule, you’re America’s problem. However, if you suddenly show up in Canada not having crossed the border from the U.S. you can claim asylum in Canada. So thousands of people are slipping across the northern border away from the border crossings and checkpoints.

Canadian MP Jenny Kwan says, “If the prime minister was serious about reducing unsanctioned border crossings, let alone truly welcoming refugees, he would have already suspended the Safe Third Country Agreement.” But just this week Trudeau said he had no plans to do that.

So after making a big show of his open borders policy, it turns out Trudeau has created a mess and is now warning that people coming north illegally, or for a better job, or even asylum seekers who set foot in America first aren’t welcome after all.