The President has delayed action on an immigration overhaul until after the November election. But across the border in Mexico, officials are in the midst of the largest crackdown on illegal immigrants in decades. This is just one reason the flow of Central American children into the U.S. has slowed from a torrent earlier this summer to a trickle now. The latest Homeland Security data shows the number of kids detained at the border in July was half the number from June. Host Madeleine Brand talks to NPR’s Carrie Kahn who’s been covering this story all summer from her home base in Mexico City.