A little-known US law, brought back in by Donald Trump, has caused a surge in migrants from Mexico. It's not what President Trump intended.You can now get the Sensemaker newsletter as an email delivered to your inbox once a day. It’s our editors’ pick of the stories that matter most right now, and why, in brief. You can sign up here for free. Or if you'd like to join Tortoise as a fully-fledged member, activate your 30-day free trial to access all our journalism.For more information on today's episode, visit tortoisemedia.com/listen. Transcripts of each episode will be made available the same day. Hosted on Acast. See acast.com/privacy for more information.