Migrants mired in transit as Mexico becomes US’s immigration enforcer

Detentions soar as critics say President Amlo willing to trade rights of migrants for political capital in Washington

Between border visits and rallies, Joe Biden and Donald Trump are duelling to control the narrative on immigration, placing the issue - and Mexico's role in it - at the heart of the coming election.

In tasking Mexico with reducing arrivals at the border, the US has given its neighbour leverage over US political discussion. On the ground, this has meant many migrants find themselves stuck in Mexico, running a gauntlet of extortion and violence as they try to make it to the northern border.