A major overhaul of US immigration law is making its way through Congress this week.
It calls for a huge increase in security along the Mexican border, as a pre-condition to legalising an estimated 11 million undocumented migrants.
But border guards may not deter deported migrants from trying to get back to their families in the US.
Al Jazeera's Rob Reynolds reports from the city of Mexicali.
Source: Al Jazeera