If a bunch of people walk up to the US-Mexico border, they'll be processed, with most turned away. Just like the last caravan. It's not a crisis. It's not even a problem. You only think it's a problem if you think the dystopian fanfic about the US having "open borders" is real.
More like they really want Camp of the Saints to be just over a horizon that never comes, so they can rile people up about impending doom forever.