Porous Texas border fence foreshadows challenges for Trump's wall

A gate in the U.S. border fence with Mexico is seen in this photo taken at the Loop family farm in Brownsville, Texas, U.S. on November 17, 2016. REUTERS/Jon Herskovitz

BROWNSVILLE, Texas (Reuters) - The rose-coloured border security fence starts in a dusty field on the Loop family farm in South Texas - about 15 miles inland from the Gulf of Mexico and a mile north of the southern U.S. border.

From there, near Brownsville, it stretches about 60 miles west, but with plenty of gaps to drive or walk through. Where it exists, the fence doesn’t always stop illegal immigrants.