Chat with us in Facebook Messenger. Find out what's happening in the world as it unfolds.

A child on the Mexican side of the U.S.-Mexico border fence looks into Arizona during a special 'Mass on the Border' on April 1, 2014 in Nogales, Arizona.
A child on the Mexican side of the U.S.-Mexico border fence looks into Arizona during a special 'Mass on the Border' on April 1, 2014 in Nogales, Arizona.

    JUST WATCHED

    U.S.-Mexico's insecure 1,900-mile border

MUST WATCH

U.S.-Mexico's insecure 1,900-mile border

Just how penetrable is the border shared by the U.S. and Mexico? CNN's Tom Foreman takes a closer look.

U.S.-Mexico's insecure 1,900-mile border

Just how penetrable is the border shared by the U.S. and Mexico? CNN's Tom Foreman takes a closer look.